As per title , need to do an oil change on the 1.9 tdi , Variable service , now i know that it needs the 507 spec , dilemma is i have enough of 2 different manufacturers to use up , but both 507 . do i go buy 4 new litres or use up what i have . Thanks

If both oils are the correct grade of oil can't see what is to stop you from mixing different brand names, what's in a name eh! besides price??

christ just use it up, they are both to spec

I would not just for peace of mind.

it's to spec - there are no issues, get it used up