Join Date: Sep 2011
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Don't use any standard automotive oil - especially in a 30-grade (5W-30, 10W-30), as it contains Friction Modifiers that may eventually make the clutch slip. A bigger issue with "regular" auto oil for most cycle engines is the lack of proper additives (ZDDP) for a cycle's valvetrain.
You are much better using a diesel oil like Rotella T5 10W-30 or a cycle-specific oil.
Just to make it confusing, Shell has introduced a new Rotella T6 synthetic "Multi Vehicle" 5W-30 which DOES NOT have the proper additives like the "regular" Rotella T6 5W-40 does. Multi Vehicle is not really a "diesel" oil, more of just a standard auto oil.
So DO NOT use any Rotella stating "Multi Vehicle" in a cycle engine.
An actual 5W-30 conventional motorcycle-specific oil is unusual - what brand is it?