MMMM not sure for a fact, but I reckon the Sthil 2 stroke oil (air cooled motors) is just re-labled Castrol TTS which is a synthetic oil for both air and water cooled. I am aware that some outboard oil differs slightly in its make up to allow for some very minor moisture related issues but then again Yamaha Yamalube is used in their air cooled racing two stroke kart motors (@ 15-18000 RPM) and their STD water cooled 2 stroke outboards!! go figure?
I suspect for the most part it is marketing for marketing's sake, to try and sell oil on a contrived point of difference. My family had a Shell servo for ~12yrs basically the motto was to go well ... screw shell
But I digress.. the engineers tech info sheets gave the marketing guy's away... BS for the most part; but the bottom line on oils was that you got what you paid for..... hope that helps..
As a general rule stay away from Castrol R30 Racing oil (try some hehehe, it smells great) as it is a castor oil synthetic blend which will gum up your motors with continued use (and help your bowel actions as well
).
