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I know for a fact that at least one oil company, (and I've no reason to doubt others may do so as well) makes a semi synthetic 10/40 oil that is SL/Cg4 rated, that means it is suitable for use in petrol and diesel engines......ah for car use you think, well yes but I was also told by the oil company (I have a trade account with them-a throwback from a business venture, but kept the oil a/c going) that they also market the same oil for motorcycles, but the container then also states JASO MA, it is compatible for motorcycles.
It would appear to be a marketing ploy as most oil companies tend to charge more for motorcycle specific oil. I and several friends have used this stuff for years in our bikes and cars. Prevoiusly it had been SJ rated when I first got it.
I was informed that it is usually thinner automotive oils that have the friction additives eg; 0/40, 5/30, 5/40. I have heard of some car biased full synthetics causing problems with bike clutches, but never semi synth or mineral. I know a bloke who races a CBR600 and a Suzuki GSXR and runs them on Vauxhalls (GM) own brand car oil 10/40 semi synth, has done for years without problems, he uses it because he can get it cheap.
I have not and never will buy a container of engine oil that states it is specificly for motorcycles, it's a rip off. Theres even people out there buying bike specific oil for Harleys and BMWs (boxer twins), why? they have seperate gearboxes and clutches, good old car oil in them too as far as I'm concerned.
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