Best Premix

Anonymous (not verified)
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Anonymous (not verified)
Edited Date/Time 2/13/2015 9:30pm
What would be the best premix to run at 50/50 with C12 and 91 pump in a stock 2013 KTM 250SX at 40:1???

I usually run R50, just exploring more options.
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Blaze45
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Blaze45 2/8/2015 6:29pm
2/8/2015 6:29pm Edited Date/Time 2/8/2015 6:31pm
Why are you mixing fuel? The bike is stock... Pick 1 fuel type, run the mixture that the OEM suggests in the manual, jet it properly and enjoy a great running 2 stroke.
Flex
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Flex 2/8/2015 6:48pm
2/8/2015 6:48pm
Blaze45 wrote:
Why are you mixing fuel? The bike is stock... Pick 1 fuel type, run the mixture that the OEM suggests in the manual, jet it properly...
Why are you mixing fuel? The bike is stock... Pick 1 fuel type, run the mixture that the OEM suggests in the manual, jet it properly and enjoy a great running 2 stroke.
On all my 2 strokes ive owned, i have never run straight pump fuel. I like detonation protection, i don't run race fuel for gains.
Brad460
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Brad460 2/8/2015 7:39pm
2/8/2015 7:39pm Edited Date/Time 2/8/2015 7:41pm
HP2

And of course the HP Trans..always remember the story about Lamson pouring HP Trans in his RM..

The Shop

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queen of spodes 2/8/2015 9:01pm
2/8/2015 9:01pm
Brad460 wrote:
HP2

And of course the HP Trans..always remember the story about Lamson pouring HP Trans in his RM..
What's the story about Lamson and the RM?
wfo4ever
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wfo4ever 2/8/2015 9:08pm
2/8/2015 9:08pm
I have used Maxima 927 for years.
WFO!
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WFO! 2/8/2015 9:42pm
2/8/2015 9:42pm
HP2 FTW
2stroked
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2stroked 2/8/2015 9:52pm
2/8/2015 9:52pm
The factories spent lots of time and money doing R&D to find out what the optimum ratio was. Its 32:1. If you run leaner than that you're retarded. if you want to go leaner because your drooling out the back, either you're not jetted properly or you're not twisting the throttle hard enough.

Ive raced two strokes my whole life. I ran yamalube for years and its the second best premix on the market in my opinion. I've been running Motul 800 for the last decade and couldn't be happier with it. Plus it smells like strawberries.

If you want pure smell and dont care about performance, bean oil will give you a hard on like a hooker at prom. Then again 927 makes my heart skip a beat everytime I smell it too.

C12 or Sunoco 110 leaded ran straight (not mixed with 91 swill) will give you you're best jetting test platform, as leaded fuel will give a true indication of how the bike is operating when you pull the sparkplug to examine it. Unleaded fuels have a tendency to give false readings in two strokes.
lostboy819 2/8/2015 10:05pm
2/8/2015 10:05pm
2stroked wrote:
The factories spent lots of time and money doing R&D to find out what the optimum ratio was. Its 32:1. If you run leaner than that...
The factories spent lots of time and money doing R&D to find out what the optimum ratio was. Its 32:1. If you run leaner than that you're retarded. if you want to go leaner because your drooling out the back, either you're not jetted properly or you're not twisting the throttle hard enough.

Ive raced two strokes my whole life. I ran yamalube for years and its the second best premix on the market in my opinion. I've been running Motul 800 for the last decade and couldn't be happier with it. Plus it smells like strawberries.

If you want pure smell and dont care about performance, bean oil will give you a hard on like a hooker at prom. Then again 927 makes my heart skip a beat everytime I smell it too.

C12 or Sunoco 110 leaded ran straight (not mixed with 91 swill) will give you you're best jetting test platform, as leaded fuel will give a true indication of how the bike is operating when you pull the sparkplug to examine it. Unleaded fuels have a tendency to give false readings in two strokes.
32:1 runs leaner than 50:1
scott_nz 2/8/2015 10:12pm
2/8/2015 10:12pm
2stroked wrote:
The factories spent lots of time and money doing R&D to find out what the optimum ratio was. Its 32:1. If you run leaner than that...
The factories spent lots of time and money doing R&D to find out what the optimum ratio was. Its 32:1. If you run leaner than that you're retarded. if you want to go leaner because your drooling out the back, either you're not jetted properly or you're not twisting the throttle hard enough.

Ive raced two strokes my whole life. I ran yamalube for years and its the second best premix on the market in my opinion. I've been running Motul 800 for the last decade and couldn't be happier with it. Plus it smells like strawberries.

If you want pure smell and dont care about performance, bean oil will give you a hard on like a hooker at prom. Then again 927 makes my heart skip a beat everytime I smell it too.

C12 or Sunoco 110 leaded ran straight (not mixed with 91 swill) will give you you're best jetting test platform, as leaded fuel will give a true indication of how the bike is operating when you pull the sparkplug to examine it. Unleaded fuels have a tendency to give false readings in two strokes.
lostboy819 wrote:
32:1 runs leaner than 50:1
I run the exact same mix with 800 2t in my 2 strokes, (although i used to run 40:1 in my 250's to stop the spooge)

and lostboy is right, 32:1 has less fuel in it than 50:1, so it is leaner, but with more oil for better piston seal,
Radical
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Radical 2/8/2015 10:14pm
2/8/2015 10:14pm
I always loved the smell of Blendzall. I'm running Yamalube at the moment.
lostboy819 2/8/2015 10:14pm
2/8/2015 10:14pm Edited Date/Time 2/8/2015 10:15pm
The more oil you have in the gas leans the jetting out because you displacing fuel with oil, the oil is for lubrication not for jetting. Its a common misconception that more oil in the premix makes it run richer, it does not it runs hotter and leaner because the fuel is what also controls how hot the engine runs and more oil in the gas = higher temps. Fuel is for jetting oil is lubrication and the oil recommendation is what you need to go by for you mix ratio as synthetics are made to run at higher ratio the petroleum based oils. Mix Bel-Ray MC1 at 20:1 and you will stick the engine. And as Mr Know it all used to say "you should have know" Tongue
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bvm111 2/8/2015 10:17pm
2/8/2015 10:17pm Edited Date/Time 2/8/2015 10:19pm
Brad460 wrote:
HP2

And of course the HP Trans..always remember the story about Lamson pouring HP Trans in his RM..
Ive always run HP trans in all my two strokes including my KX's.... They are not known for having the strongest clutches or smothes transmissions and found that th Honda oil is the best.

Run straight C12 even in a stock two stroke and be dissapointed that it actually does run better and its 12.50 a gallon! I dont care what everyone says that if it doesn't detonate on pump you dont need straight race gas... Ok... You havent run them back to back and it does make a difference! The ethanol i pump gas will cause pinging an detonation its garbage!

Yes 50:1 is leaner oil mixture but it is richer fuel ratio... 32:1 provides the best midrange due to better sealing rings with richer oil and 40:1 will give a tad more overrev!

Oh and castor oil smells awesome bu have fun scraping carbon... Any quality synthetic will be aweome, ive been running Motul 800 with excellent results lately but have had great success with maxima K2 at 32:1!
malachi177
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malachi177 2/8/2015 10:53pm
2/8/2015 10:53pm
C12 and Amsoil Dominator at 36:1. I run AutoTrack II in the trans.
jeffro503
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jeffro503 2/8/2015 10:55pm
2/8/2015 10:55pm Edited Date/Time 2/8/2015 10:56pm
40:1 with 927 for me with 50/50 race fuel and non-ethanol pump gas. It depends on your exhaust , jetting and other things as well. Granted I haven't ran the RM 250 this winter as I really need to get the suspension done and a new bar setup ( Renthal 922....same as my Kawi 450 ).

With that being said , I have a few buddies that run the 927 during the warmer months and will switch to something else during the winter....as 927 seems to separate more during the cold months. Don't know the whole story on this , so I'll ask them the next time I talk to them.
bvm111
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bvm111 2/8/2015 11:41pm
2/8/2015 11:41pm
jeffro503 wrote:
40:1 with 927 for me with 50/50 race fuel and non-ethanol pump gas. It depends on your exhaust , jetting and other things as well. Granted...
40:1 with 927 for me with 50/50 race fuel and non-ethanol pump gas. It depends on your exhaust , jetting and other things as well. Granted I haven't ran the RM 250 this winter as I really need to get the suspension done and a new bar setup ( Renthal 922....same as my Kawi 450 ).

With that being said , I have a few buddies that run the 927 during the warmer months and will switch to something else during the winter....as 927 seems to separate more during the cold months. Don't know the whole story on this , so I'll ask them the next time I talk to them.
Jeff,

The castor bean oil is known to separate even at normal temps, that's why you really have to shake the shit out of the can to ensure proper solution of the oil but especially at cold temps!

Castor smells awesome...especially in C12 but just run the full synthetic.... Amsoil, Motul, Maxima K2, Motorex... They all work awesome and you won't be scraping carbon when you do a top end... Just wipe everything clean!
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jeffro503 2/8/2015 11:46pm
2/8/2015 11:46pm
jeffro503 wrote:
40:1 with 927 for me with 50/50 race fuel and non-ethanol pump gas. It depends on your exhaust , jetting and other things as well. Granted...
40:1 with 927 for me with 50/50 race fuel and non-ethanol pump gas. It depends on your exhaust , jetting and other things as well. Granted I haven't ran the RM 250 this winter as I really need to get the suspension done and a new bar setup ( Renthal 922....same as my Kawi 450 ).

With that being said , I have a few buddies that run the 927 during the warmer months and will switch to something else during the winter....as 927 seems to separate more during the cold months. Don't know the whole story on this , so I'll ask them the next time I talk to them.
bvm111 wrote:
Jeff, The castor bean oil is known to separate even at normal temps, that's why you really have to shake the shit out of the can...
Jeff,

The castor bean oil is known to separate even at normal temps, that's why you really have to shake the shit out of the can to ensure proper solution of the oil but especially at cold temps!

Castor smells awesome...especially in C12 but just run the full synthetic.... Amsoil, Motul, Maxima K2, Motorex... They all work awesome and you won't be scraping carbon when you do a top end... Just wipe everything clean!
Thank you brother! I am a little out of the loop with the 2 stroke stuff , but tend to learn a lot more this next spring ( or earlier! ). Damn man.....I'm going to put so much time on the 2 stroke this summer it's going to be crazy.

We're going to have a very , very early spring here! First week in Feb.....and this past week I've been getting woke up in the morning by a bunch of birds which have already flown back up here from the south! Crazy! Also means we are going to have a long , hot and wicked summer I think. Worse than last year!
RPM68
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RPM68 2/9/2015 6:18am
2/9/2015 6:18am
2stroked wrote:
The factories spent lots of time and money doing R&D to find out what the optimum ratio was. Its 32:1. If you run leaner than that...
The factories spent lots of time and money doing R&D to find out what the optimum ratio was. Its 32:1. If you run leaner than that you're retarded. if you want to go leaner because your drooling out the back, either you're not jetted properly or you're not twisting the throttle hard enough.

Ive raced two strokes my whole life. I ran yamalube for years and its the second best premix on the market in my opinion. I've been running Motul 800 for the last decade and couldn't be happier with it. Plus it smells like strawberries.

If you want pure smell and dont care about performance, bean oil will give you a hard on like a hooker at prom. Then again 927 makes my heart skip a beat everytime I smell it too.

C12 or Sunoco 110 leaded ran straight (not mixed with 91 swill) will give you you're best jetting test platform, as leaded fuel will give a true indication of how the bike is operating when you pull the sparkplug to examine it. Unleaded fuels have a tendency to give false readings in two strokes.
KTM's dont run well at 32:1.

Ive been running 50:1 with Motul 800, HP Transoil with Sunoco 110. My bikes are crisp and jetted beautifully.

Go look at some videos of my 250 and 300. They sound nasty!!!

Pit Row

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Darryl916
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Darryl916 2/9/2015 7:15am
2/9/2015 7:15am Edited Date/Time 2/9/2015 7:16am
Stock 07 CR250

Castor 927
Straight 100LL
40:1

I make sure to shake because it does seem to separate. Winter seems to be a little worse on the separation in my experience.



Always tempted to try something else but I have never had problems so no reason to change.
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JeepnMike 2/9/2015 7:19am
2/9/2015 7:19am
Laughing

NV/HC!
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NV/HC! 2/9/2015 7:28am
2/9/2015 7:28am
In the KTM manual it says to run 60:1. I run mine 50:1 on a 2014 250x. Must have something to do with the smaller carbs on those bikes. Good on you for running some higher octane, especially on a KTM. Pump gas blows. Your bike runs like shit and pings on that stuff. For oil I go with Motul 800 but Yamalube is highly recommended by professional mechanics.
seth505
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seth505 2/9/2015 7:32am
2/9/2015 7:32am Edited Date/Time 2/9/2015 7:36am
2stroked wrote:
The factories spent lots of time and money doing R&D to find out what the optimum ratio was. Its 32:1. If you run leaner than that...
The factories spent lots of time and money doing R&D to find out what the optimum ratio was. Its 32:1. If you run leaner than that you're retarded. if you want to go leaner because your drooling out the back, either you're not jetted properly or you're not twisting the throttle hard enough.

Ive raced two strokes my whole life. I ran yamalube for years and its the second best premix on the market in my opinion. I've been running Motul 800 for the last decade and couldn't be happier with it. Plus it smells like strawberries.

If you want pure smell and dont care about performance, bean oil will give you a hard on like a hooker at prom. Then again 927 makes my heart skip a beat everytime I smell it too.

C12 or Sunoco 110 leaded ran straight (not mixed with 91 swill) will give you you're best jetting test platform, as leaded fuel will give a true indication of how the bike is operating when you pull the sparkplug to examine it. Unleaded fuels have a tendency to give false readings in two strokes.
So you are stating that all oil is created equal on your 32:1 comment, are you sure you know who is retarded? Silly

To answer the OP, I have a 250sx as well and run Amsoil 40:1 with C12/pump gas. No I don't know the BEST oil to use because I have not tested them all Smile
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mxb2 2/9/2015 7:35am
2/9/2015 7:35am
Radical wrote:
I always loved the smell of Blendzall. I'm running Yamalube at the moment.
How is the quality on blendzall? I live 15 minutes from their plant. I ll have to go check it out. I know back in the day it was real popular.
Flex
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Flex 2/9/2015 7:38am
2/9/2015 7:38am
2stroked wrote:
The factories spent lots of time and money doing R&D to find out what the optimum ratio was. Its 32:1. If you run leaner than that...
The factories spent lots of time and money doing R&D to find out what the optimum ratio was. Its 32:1. If you run leaner than that you're retarded. if you want to go leaner because your drooling out the back, either you're not jetted properly or you're not twisting the throttle hard enough.

Ive raced two strokes my whole life. I ran yamalube for years and its the second best premix on the market in my opinion. I've been running Motul 800 for the last decade and couldn't be happier with it. Plus it smells like strawberries.

If you want pure smell and dont care about performance, bean oil will give you a hard on like a hooker at prom. Then again 927 makes my heart skip a beat everytime I smell it too.

C12 or Sunoco 110 leaded ran straight (not mixed with 91 swill) will give you you're best jetting test platform, as leaded fuel will give a true indication of how the bike is operating when you pull the sparkplug to examine it. Unleaded fuels have a tendency to give false readings in two strokes.
RPM68 wrote:
KTM's dont run well at 32:1. Ive been running 50:1 with Motul 800, HP Transoil with Sunoco 110. My bikes are crisp and jetted beautifully. Go...
KTM's dont run well at 32:1.

Ive been running 50:1 with Motul 800, HP Transoil with Sunoco 110. My bikes are crisp and jetted beautifully.

Go look at some videos of my 250 and 300. They sound nasty!!!
Yup, they are jetted for 60:1 and 50:1.

40:1 seems to work for me fairly well.
shiftmx_22 2/9/2015 7:41am
2/9/2015 7:41am
2stroked wrote:
The factories spent lots of time and money doing R&D to find out what the optimum ratio was. Its 32:1. If you run leaner than that...
The factories spent lots of time and money doing R&D to find out what the optimum ratio was. Its 32:1. If you run leaner than that you're retarded. if you want to go leaner because your drooling out the back, either you're not jetted properly or you're not twisting the throttle hard enough.

Ive raced two strokes my whole life. I ran yamalube for years and its the second best premix on the market in my opinion. I've been running Motul 800 for the last decade and couldn't be happier with it. Plus it smells like strawberries.

If you want pure smell and dont care about performance, bean oil will give you a hard on like a hooker at prom. Then again 927 makes my heart skip a beat everytime I smell it too.

C12 or Sunoco 110 leaded ran straight (not mixed with 91 swill) will give you you're best jetting test platform, as leaded fuel will give a true indication of how the bike is operating when you pull the sparkplug to examine it. Unleaded fuels have a tendency to give false readings in two strokes.
Are you saying that KTM hasn't put a lot of time and money into doing R&D to find out the optimum ratio? Because they spec 40:1 in the owner's manual.
Flex
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Flex 2/9/2015 7:43am
2/9/2015 7:43am
2stroked wrote:
The factories spent lots of time and money doing R&D to find out what the optimum ratio was. Its 32:1. If you run leaner than that...
The factories spent lots of time and money doing R&D to find out what the optimum ratio was. Its 32:1. If you run leaner than that you're retarded. if you want to go leaner because your drooling out the back, either you're not jetted properly or you're not twisting the throttle hard enough.

Ive raced two strokes my whole life. I ran yamalube for years and its the second best premix on the market in my opinion. I've been running Motul 800 for the last decade and couldn't be happier with it. Plus it smells like strawberries.

If you want pure smell and dont care about performance, bean oil will give you a hard on like a hooker at prom. Then again 927 makes my heart skip a beat everytime I smell it too.

C12 or Sunoco 110 leaded ran straight (not mixed with 91 swill) will give you you're best jetting test platform, as leaded fuel will give a true indication of how the bike is operating when you pull the sparkplug to examine it. Unleaded fuels have a tendency to give false readings in two strokes.
seth505 wrote:
So you are stating that all oil is created equal on your 32:1 comment, are you sure you know who is retarded? :silly: To answer the...
So you are stating that all oil is created equal on your 32:1 comment, are you sure you know who is retarded? Silly

To answer the OP, I have a 250sx as well and run Amsoil 40:1 with C12/pump gas. No I don't know the BEST oil to use because I have not tested them all Smile
I am so tempted to try out Dominator... They had a case of 4 bottles that were 1 gallon each for 59 bucks on clearance and man i wanted to pick it up!!! Seems like you run the same everything as me except premix, does it run really well?
Original 44
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Original 44 2/9/2015 7:50am
2/9/2015 7:50am Edited Date/Time 2/9/2015 7:53am
2stroked wrote:
The factories spent lots of time and money doing R&D to find out what the optimum ratio was. Its 32:1. If you run leaner than that...
The factories spent lots of time and money doing R&D to find out what the optimum ratio was. Its 32:1. If you run leaner than that you're retarded. if you want to go leaner because your drooling out the back, either you're not jetted properly or you're not twisting the throttle hard enough.

Ive raced two strokes my whole life. I ran yamalube for years and its the second best premix on the market in my opinion. I've been running Motul 800 for the last decade and couldn't be happier with it. Plus it smells like strawberries.

If you want pure smell and dont care about performance, bean oil will give you a hard on like a hooker at prom. Then again 927 makes my heart skip a beat everytime I smell it too.

C12 or Sunoco 110 leaded ran straight (not mixed with 91 swill) will give you you're best jetting test platform, as leaded fuel will give a true indication of how the bike is operating when you pull the sparkplug to examine it. Unleaded fuels have a tendency to give false readings in two strokes.
Exactly 2 stroke.

I have always used Yamalube mixed 32:1 with straight cam 2 (Sunoco 110). Been racing two strokes since 1977 and never had an engine failure. I am religious on cleaning air filters and changing rings and pistons when needed. Tranny oil is replaced every ride.
seth505
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seth505 2/9/2015 7:58am
2/9/2015 7:58am
2stroked wrote:
The factories spent lots of time and money doing R&D to find out what the optimum ratio was. Its 32:1. If you run leaner than that...
The factories spent lots of time and money doing R&D to find out what the optimum ratio was. Its 32:1. If you run leaner than that you're retarded. if you want to go leaner because your drooling out the back, either you're not jetted properly or you're not twisting the throttle hard enough.

Ive raced two strokes my whole life. I ran yamalube for years and its the second best premix on the market in my opinion. I've been running Motul 800 for the last decade and couldn't be happier with it. Plus it smells like strawberries.

If you want pure smell and dont care about performance, bean oil will give you a hard on like a hooker at prom. Then again 927 makes my heart skip a beat everytime I smell it too.

C12 or Sunoco 110 leaded ran straight (not mixed with 91 swill) will give you you're best jetting test platform, as leaded fuel will give a true indication of how the bike is operating when you pull the sparkplug to examine it. Unleaded fuels have a tendency to give false readings in two strokes.
seth505 wrote:
So you are stating that all oil is created equal on your 32:1 comment, are you sure you know who is retarded? :silly: To answer the...
So you are stating that all oil is created equal on your 32:1 comment, are you sure you know who is retarded? Silly

To answer the OP, I have a 250sx as well and run Amsoil 40:1 with C12/pump gas. No I don't know the BEST oil to use because I have not tested them all Smile
Flex wrote:
I am so tempted to try out Dominator... They had a case of 4 bottles that were 1 gallon each for 59 bucks on clearance and...
I am so tempted to try out Dominator... They had a case of 4 bottles that were 1 gallon each for 59 bucks on clearance and man i wanted to pick it up!!! Seems like you run the same everything as me except premix, does it run really well?
Yup, no complaints. I run it in my 125 as well and I also ran it in my 09 yz 250 I had since brand new and ran for 4 years. Other than a few fresh top ends she ran great for all those seasons.
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MXD 2/9/2015 7:58am
2/9/2015 7:58am
lostboy819 wrote:
32:1 runs leaner than 50:1
God bless you, sir. I got tired of trying to explain this concept years ago.
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Trav138 2/9/2015 8:00am
2/9/2015 8:00am
bvm111 wrote:
Jeff, The castor bean oil is known to separate even at normal temps, that's why you really have to shake the shit out of the can...
Jeff,

The castor bean oil is known to separate even at normal temps, that's why you really have to shake the shit out of the can to ensure proper solution of the oil but especially at cold temps!

Castor smells awesome...especially in C12 but just run the full synthetic.... Amsoil, Motul, Maxima K2, Motorex... They all work awesome and you won't be scraping carbon when you do a top end... Just wipe everything clean!
I agree, i just never understood the fascination of boy it smells good, when it is an inferior oil... Why not use a superior oil that your engine will benefit from.
I used Motul for a long time and it does exactly what it should do, and i still get impressed when i teardown/inspect

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