quote:
Originally posted by AHC:
I've been running 3,000 miles OCI's with Amsoil 5W-20 and Mobil 1 0W-20 since my 01 5.4L's first oil change. I now have about 20K miles and no issues so far. Just switched to Royal Purple 5W-20 for fun. Seems to be a little quieter than the Mobil 1 under hard acceleration.