One4R is wrong regarding longevity.
The molecules in synthetic are not the same as in petroleum-based oils. But thats not the important thing.
The two important things are a) how fast does the wet clutch reduce the viscosity to dangerous levels, and b) how long does it take for the oil to degrade and produce acidic contaminants.
First, synthetic oils do not degrade into acidic contaminants. They don't have enough of the kind of hydrocarbons found in petroleum-based oils to produce acid. Acidic contaminants eat bearings among other things.
Second, and several oil companys have done valid extended lab and field tests to prove it, the good synthetic oils retain viscosity in wet clutch applications longer than the petroleum oils. This is not my opinion, both AMSOIL and Mobil have valid tests published. AMSOIL has literally 100 pounds worth of documents showing results.
AMSOIL has done the most testing, and they had it done by various respected labs and government agencies. One simple test is running the automotive blend in New York taxi cabs. Another was a straight up viscosity shoot out.
But its not whether AMSOIL is better than any other synthetic, but that all good synthetics will retain viscosity in a wet clutch environment longer than any petroleum-based oil, and will have much better longevity than petroleum-based oils.
* Last updated by: privateer on 5/15/2012 @ 7:30 AM *
Better to be judged by 12 than carried by 6