To condense this discussion, the issue is the wet clutches, no matter where they might be.
The base oil has nothing to do with the slippery clutch thing, it is all in the additives, whatever they may be.
Testing and discussion on this has been going on practically forever, so just look for it.
Just as an aside thi also affects all of the wet clutch motorcycles, etc.
Just about the only thing that does not have an oil bathed clutch is a snowmobile (or lawnmower)
that uses a pulley to tighten its grip on the belt, and off she goes,
Here, be prepared to experience burnt rubber smell and smoke.
Also, the Vee belts do break and leave you stranded,
hopefully just in your back yard, eh ?
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