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Old 01-24-2019, 05:46 PM   #12 (permalink)
jkv357
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Join Date: Jul 2011
Location: WI
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You don't want that oil! That's standard automotive oil.

Clutch slippage isn't the issue, it's the lack of adequate ZDDP (Zinc and Phosphorus) that's the problem. Those levels (600ppm) are fine for a current auto engine with roller rockers, but not for a solid, non-roller, valvetrain like cycles use. You want around 1200ppm for a cycle engine. ZDDP is sacrificial and protects the cam and rocker faces (high pressure areas) from galling at times when flow is minimal - you want it.

Use a diesel oil like Rotella T5 or T6 - but NOT the new "Multi Vehicle" 5W-30 Rotella T6 - it has low ZDDP levels like regular auto oils.
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