I am not sure what 'grade' of 20w50 engine oil was used, ie fully synth, semi-synth or mineral.
i have been able to only find motul 3000 4T 20w50 oil, but it says that it is motor oil mineral. cheers
gs1150
Dont bother with fully synth as its a waste of money.Use semi-synth if you want to give the bike a treat or just normal mineral oil.
These old tanks effectively have car engines in them so no need to bother about any bike specific oils.
Remember 15/50 or 20/50 and no lower than SF or SG spec
Oh yeah,just leave the grammar nazis to play with themselves.


. Don't use virgin olive oil, 1150GS's aren't compatible with virgins.

