I usualy buy 5 litres of whatever oil is best value or on promotion at the time, when oil change is due. My MK2 Jazz only takes 3.4L of oil, so I always end up with 1.6L left over.
I've 1.6L of Petronas oil that is <1yrs old, and some Castrol. Both A5/B5 5w30 spec.
Question I'm asking, is it OK to mix brands of oil? I've researched online, but can't find anything conclusive.
This forum is blessed with lots of wisedom and knowledge........opinions please!