Quote:
Originally Posted by alex.s
can you please explain this further- why would a moto need extra last-level protection vs a car (ie head rpm plz), and what zinc does to a wet clutch. what about molyb content?
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Current auto engines have roller valvetrains - cycles do not (exception Honda CBR250R).
Zinc and Phosphorous are sacrificial and will protect surfaces with high pressure contact before they have adequate oil flow.
Zinc does not have an effect on the clutch. Moly ("Friction Modifiers" - i.e. "Energy Conserving") does, but it's only in 30-grade and below auto oils - so it shouldn't even be an issue.
Engines with a ton of miles in a relatively short period have less wear in general. Less cold starts = less wear. Lower viscosity oil and oil with high levels of ZDDP are most beneficial for high performance engines (high pressure valve springs) during cold starts.
The only way to tell if you are getting damage to the valvetrain from incorrect oil is to pull the valve cover and look at the cams, but it very easy to prevent by using the proper oil with the proper additives for your particular engine - which is
not auto oil for a cycle.