A short while ago I posted a question about what oil I might use in a 2004 Mercury Grand Marqius I bought. It only has 30,000 miles on and still looks brand new, except for a couple of bad spots in the paint which seems to be a normal problem of white cars from Fomoco of that vintage. The owners manual was actually in the trunk, it calls for synthetic blend so I decided I'm going to run full synthetic. I don't see a problem with going that route since it is so low mileage. God Bless, Beth and Allen.