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years ago motul had some chart saying the 10w40 motul 5100 protected better at higher temps
this was when I was using an oil dipstick temp gauge on a couple bikes


now it could be hype that they put out to promote the oil
but I've been using it ever since

usually around $14 per quart so its about twice as much as typical motorcycle oil

I also change oil in all my bikes around 1000 miles because they really don't hold much oil so it could wear down faster because of how much it holds
 

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For those who are first time motorcycle owners, DO NOT put in automobile oils. You need to use motorcycle specific oils because our clutches share the lubrication and the additives in car oils do not work well with clutches. Otherwise, stick with a quality brand and keep it within the dipstick range (high/low) to have a happy motorcycle.

Are car oils suitable for a motorcycle? - Motorbike Writer
 

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Both Rotella T 15W-40 conventional and, Rotella T6 5W-40 Synthetic both list the JASO MA standard; this information can be found on the bottle adjacent to the SAE/API rating stamp. JASO is an acronym that stands for "The Japanese Automotive Standards Organization." Note that the 10W-30 conventional oil does not list JASO-MA. These oils lack the friction modifiers that dampen wet clutch performance.

Can not justify paying $10+ a quart when i can get the rotella for $15 a gallon.
 
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