the manual recommends mineral oil.
of course you can use synthetic oil and ...40 ist o.k., but in my opinion it is not necessary for normal use.
main thing on oil is the API classification and not the brand. refer to your manual and use oil according to this or better (mineral or synthetic).
but you should use an oil designed for motorcylces because here the oil has to serve also the gears and the clutch (which is not the case in a car engine).
regards
klaus
|