I have a 1989 BMW 325is with 123K miles that has been running dino 20w50 oil for the past few years. I'm thinking about switching to Mobil 1 15w50 as many others have, but lots of people claim that this switch can lead to oil leaks do to the different composition of synthetic oil. Synthetic oil supposedly undos some of the seals that the thick, old dino oil has formed.
What are your experiences or thoughts on this?
What are your experiences or thoughts on this?