2015 Kx450f recommended oil?

What did the manual say?,that being said, i have been using bel ray thumper oil, in my 12 kawy 450, 13, rmz 450, and gn4 in my 15 crf 450, use a good quality oil, get a hr meter, or document changes in the manual., oil. advice on vital usually turns into a shit show. Lol.

I run the wet clutch $3.27 a qt stuff from walmart and change it often never had any issues

Amsoil synthetic, or maxima premium 4 is good stuff! Havent had a single issue with them. Just be careful when installing/uninstalling the oil filter cover. My oem chipped off a chunk of metal and had to order a new one. I'd reccommend a billet aluminum one from the get go.

Shell Rotella T6 5w40

Paw Paw

yamalube

Lucas Oil moly synthetic, plain synthetic, or semi synthetic all have treated me well. Use a hour meter, keep track of any changes you make, and change regularly.

My local race shop recommended Chevron Delo 400. I put 93 hrs on the bike then had it professionally rebuilt by the same tuner- a complete deal with crank, piston, cylinder head reconditioning with new valves and seals. The tuner showed me all my old parts (head, crank,main bearings, piston, etc) and there was easily another 50 hrs left on the parts. The only real wear was some pitting on 2nd gear. Any professional tuner will tell you to plan on replacing 2nd gear if the crank is replace as it is a common wear item.

Anyway, I was happy with the result. Oil was changed every 2-3 rides, and always a new air filter.