Sorry if this post steps on the toes of some others that have posted here in this thread. That's the problem with oil threads, lots of conflicting information which means different people often being openly contradicted - NOTHING PERSONAL.
Synthetic oils come in different varieties: true synthetic (group 4) and super processed dino oil (for lack of a better term) - group 3. This is not to be confused with mixed synthetic which is most usually a mix of dino and group 3.
There is nothing wrong with mixing synthetic with dino - the blends are just that. Even when using true synthetic.
The main advantage of synthetic oils is that they last longer thus you can extend your change interval. They are not more slippery thus they don't protect better - EXCEPT if you overheat the crap out of your engine (which IS possible with an air cooled engine). Synthetics are even appropriate for break-in since again, they are not more slippery. Many OE engines come with synthetic oil from new (like BMW) so no worry about rings not seating and the like.
Most of the newer dino car oils have a very low zinc content. Frankly, I'm not sure if this is a TRUE problem or not - I suspect not. My opinion (key word) is that diesel engine dino oil is a better option since the additive package is more robust and thus appropriate for motorcycles engines.
Hope this information helps clear up some confusion.
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