I just got a cherry '86 Accord LXi with 56K original miles. It is the engine that has fuel injection. I am curious about running synthetic in it, such as Mobil 1. My concern is developing an oil leak. I know 56K is pretty low miles but I am also concerned about the age of the seals. Right now it has absolutely no leaks and burns no oil whatsoever. There was one previous owner and he took care of it well. Would you switch to Mobil 1? If so, what weight? Should I leave well enough alone and stick to Pennzoil dino? Thanks for your input!