My LA120 manual says I can use API SG. Must be an old rating since I can't find anywhere. Can I use API SM? I was once told any new grade would work for all previous grades, however, that was for a car engine.
My LA120 manual says I can use API SG. Must be an old rating since I can't find anywhere. Can I use Walmart Supertech SM? I was once told any grade would work for all previous grades, however, that was for a car engine.