ORIGINAL: Mastertech
Mobile one works great in any non-pumped engine. Never use any after run oil in a pumped eng like the OS and YS. The oil will attack certain parts in the pump.
I have always used transmission oil and marvel mystery oil 50-50 on all my non OS and a light oil like 3 in 1 for my OS I have no YS engines! But should not use even the 3 in 1 on the OS? Thanks Bob