(09-08-17, 12:39 PM)PaulSmith link Wrote: [quote author=Slaninar link=topic=23009.msg265783#msg265783 date=1502215739]Until I see a parallel test showing one worse then the other, I don't see a risk.
...
Until I see a parallel test of two engines run on a car and motorcycle specific oil, I'd rather not risk it.
[/quote]
I understand your point. Also, your vast experience with trouble free use of car oil does sound encouraging. However, for what research I could find (might sound like a digression, but I'll get to the point), synthetic oil is superior to mineral/semi synth oil in terms of high temp stability, low temp flow and engine wear protection. Price difference between good quality fully synth car and motorcycle oil is very small (at least in my country) - of course, most synthetic car oils can't be used with a (motorcycle's) wet clutch. So it boils down to - motorcycle specific fully synth vs mineral oil (price difference between car and motorcycle mineral oils aren't that big either, though bigger than between the synth ones).
It is just the matter of whether the benefits do make a difference in say a 200.000 km long motorcycle engine lifetime, after which probably most other parts will be shot and a new(er) bike will be bought. One should also take prolonged service interval that fully synth oils provide into consideration - since it ends up in less oil changes (less hassle), with similar amount of money spent on oil.
Do you have experience with disassembling similar engines after numerous oil changes - are the ones run with synthetic oils different to the ones run on mineral oil in terms of wear and dirt deposits?
Most things done in a hurry need to be done again - patiently.