World Superbike Racer
Join Date: Mar 2007
Location: Princeton NJ, Ithaca NY (school)
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They make bike oil for a reason. There are many examples of clutches slipping with car oil. It's not made for high rpm's. It doesn't have the additive packages bike oils have.
And I'm not sadly mistaken about the weight. 10w is 10w. HP4 10w is not any heavier than any other 10w oil. If you think that's the case it's all in your head. 10w-40 feels the same as 10w-50 because it doesn't become 40w or 50w until it gets heated.
"As to the question of whether you really need motorcycle oil, it's clear that the contents of the additive packages for car and motorcycle oils is predicated by different concerns. In the case of automobiles the latest lubricants are primarily designed to reduce internal friction and save fuel; whereas motorcycle oils are geared more toward handling high rpm loads while also operating in transmissions and wet clutches."
"With the API, SH and the new SJ standard, automotive oils have begun to cause problems in motorcycle engines. Oils with friction modifiers cause slippage of clutches, starter clutches and back-torque limiters. In addition, transmission gear and camshaft wear, as well as pitting, have increased with the absence of antiwear and extreme-pressure additives."
"Even some of the big oil companies, such as Castrol and Pennzoil acknowledge the situation by making motorcycle-specific oils. It's no longer wise to use current standard automotive oil in your motorcycle. The money you save on the oil purchase is lost in damage to your engine and drive-train."
"The final decision is yours. You may not have a problem now and feel quite content using automotive oils. But three independent magazines and the motorcycle manufacturers are all warning us that we could experience expensive problems down the road."
Last edited by NewRedRider; 08-24-2007 at 09:45 AM.