I recently bough a 2006 Ford Focus with the 2.0 Duratec. It has 98,000 right now and I am driving about 100 highway miles per day. I currently have 5W20 Motorcraft syn blend from the dealer (I got 2 free oil changes). There are no leaks and the engine is clean and dry. Should I continue with Motorcraft blend for 5,000 OCI or switch to synthetic? I have used SynPower and M1 in the past on other vehicles. From what I can tell Motorcraft blend is a great oil and may do the job just fine.