hey guys, can i run synthetic car oil in my kx250F instead of the recomended oil castrol synthetic super bike oil, which is 15$ for 1.5L :naughty:

Yeah you can run it, but it may or may not be good to do so. Which syn car oil are you talking about? Some might be OK and some might might not, but you're generally safe with an oil that's rated JASO MA (motorcycle oil).

i was looking into Mobil 1 Gold cap, of the same grade as the castrol r4 stuff

mobil 1 is what i run in my 450 and was told by windams old driver to run

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