I remember reading somewhere you should not switch to synthetic oils till the engine is broke in because they are so slick-ect. ect.-
So what is considered "broken in " for a 400 engine, I have a little over 4000 now and would like to start with Mobil 1 or it's equivalent. :?
So what is considered "broken in " for a 400 engine, I have a little over 4000 now and would like to start with Mobil 1 or it's equivalent. :?