Wow Jeff, what a killer article! Recommended reading for all of you guys.
OK I have heard that after having a lot of miles on your car using regular oil that it is a no no to switch to synthetic. Whats the reason for this?
The reason I ask is that I would love to switch to synthetic oil, but have 150k miles logged on my car with regular oil. I try and change the oil every 2k to 3k, but dont know what previous owners did.
So is there anything I can do to safely switch to synthetic? Or am I better off staying with regular oil?
It's a 87 300E.