Originally Posted by JakeCV
Yes, I believe the Motorcraft is a synthetic blend and this is not. I didn't think that would make so much of a difference. Dang those good deals can get ya sometimes. I was feeling a little poor that day or I wouldn't have gotten it.
I'll try switching back to a Motorcraft filter and see if that makes a difference. Would it hurt adding a quart of PEAK synthetic oil to it and making my own blend?
Actually, I think the Motorcraft Oil I used for the first 100k or so was not a synthetic blend, but the more recent ones have been. Can you still get non-synthetic or non-synthetic blend Motorcraft oil?
I'm not sure about switching syn blend with conventional motor oils, but I have heard switching to and from fully synthetic and conventional oil can cause temporary oil leaks. Won't hurt the engine as far as I know.
As for adding Peak synthetic to the Peak conventional oil & making a blend, I couldn't tell you on that one.
It would probably be easier to change it again with the Motorcraft oil & filter. I'm not saying whats in there now will hurt anything, but at least you'll have peace of mind :)
I think all Motorcraft oils are syn-blend except for the heavy duty oils.