Best motor oil in a new 4-stroke?

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4/19/2018 1:11 PM

Just purchased my first new bike (don't worry there will be pics soon) and was wondering what oilsy'all choose to run. It's a 2018 yaz250f so I had planned on just running yamalube but I know many people on here are die hard Rotella fans. Hit me with your knowledge/opinions about oil brands. Is synthetic or non synthetic better?

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Greg D.
2018 yz250f

4/19/2018 1:16 PM

Amsoil

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4/19/2018 1:30 PM

My vote goes to Amsoil.

I have been using it for my 4 latest bikes( 14, 16, 17 SXF 450 and 07 RM 250) and it has been completely flawless. I'm not going to change oil anytime soon.

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Current fleet of two wheeled vehicles:
- KTM SX 250 2020
- Suzuki GSX-R 600 K7 track spec
- Canyon Sender CF 8.0 2018 Downhill
- Canyon Spectral:ON 7.0 2019 EMTB
- White GX Pro 20 Gravel

4/19/2018 1:49 PM

I've heard some tribologists recommend running a conventional oil for break-in and then switching to synthetic. The reasoning is that synthetic protects so well that you cannot achieve good surface mating with it. I'm not sure I believe that, but at least the theory is respectable.

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Braaapin' aint easy.

4/19/2018 1:55 PM
Edited Date/Time: 4/19/2018 1:55 PM

Any name brand motorcycle oil will be just fine, just change it on the regular. Semi-synthetic is by far the biggest seller at the shop I'm at. Seems like the perfect in between for those on the fence.

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4/19/2018 2:00 PM

Oil recomemdations are like debating religion and politics. Everyone has their own preferences. But, since you bought a yamaha I will suggest Yamalube. They will also warranty your motor if there's any catastrophic damage. Yamalube, designed by a Yamaha engineer. Your salesman didn't tell you? Keep all receipts of oil changes and preventative maintenance.

https://www.yamalubeadvantage.com

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4/19/2018 2:02 PM

Falcon wrote:

I've heard some tribologists recommend running a conventional oil for break-in and then switching to synthetic. The reasoning ...more

Yes, this is very true.

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4/19/2018 2:07 PM

Maxima Premium. Started using this after being an Amsoil supporter and you wouldn't believe the difference in how clean it is when it comes back out compared to the Amsoil. Much better on clutches then synthetic too. Oil threads are a no win discussion this is just my experience so don't qoute me and try to dispute any of my claims.

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4/19/2018 2:18 PM

Also curious about this as I am buying my first 4 stroke and new bike soon. (Kxf250)

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4/19/2018 2:19 PM

Cone valves, definitely cone valves

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4/19/2018 2:23 PM

40acres wrote:

Oil recomemdations are like debating religion and politics. Everyone has their own preferences. But, since you bought a yamaha ...more

The warranty only works for "non-competition" models.

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4/19/2018 2:23 PM

Yamalube Oil or Maxima Premium 10/40

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2017 RMZ450
2005 YZ250-sold :,(
1998 YZ250
2005 KX250F

80% of the time it works every time
IG @2HRacing
Thanks to : Factory Effex, N2Dirt, Acerbis, DT1, Fasthouse, Matix, FMF, ASV, 100% & Mika Metals

4/19/2018 2:29 PM

I like to use Maxima Break-In oil for a fresh motor/rebuild, then Maxima 530MX syn

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4/19/2018 4:45 PM

Thanks for all of the quick responses! I think I will most likely stick with Yamalube for now, ( I'd like to be consistent with the oil) Since it is readily available to me at my local shop.

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Greg D.
2018 yz250f

4/19/2018 4:52 PM

The frequency of oil changes is WAY more important than the oil quality. I change my oil and filter every 2 motor hours, air filter every 2-3, but if it's super dusty, every ride.

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4/19/2018 5:05 PM

l run a semi synthetic diesel oil in my 2011 RMZ450' l think the major point to consider is the oil weight, not brand; they are all good these days. The manual would quote 10w40 but unles you are riding in sub zero temps and never warm your bike up, the 10w40 is too thin for best protection.

l have always run 15w50, my RMZ has done over 250 hours, ridden quite hard, still has not dropped compression at all ! Hasn't needed a valve adjustment either yet. On big-bore 4-strokes (450's) the main point is frequent oil changes because they end-up with fuel build-up in the oil, breaking it down.

A thinner oil may give you an extra half of a horsepower if you need it running at the front of the pack.

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Melbourne, Australia. Current rides: '11 RMZ450, '84 CR500, '06 DRZ400, '79 KX250 with 400 engine, '06 GSXR1000 full Yosh racebike.

4/19/2018 5:28 PM

Rotella, I have been running it for years and years. Had a 1997 cbr1100xx i bought new ran it from the begining. Sold it with almost 200k on the clock and never had been opened up.

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