quote:
Originally posted by wtd:
My girlfriend drives a 2003 Superduty with the 6.0 and when the dealer was changing the oil under the maintenance plan, they used 10W-30 Motorcraft diesel oil. Thats all they recommend for this engine. When I started changing the oil for her, I called up a few other ford dealerships and it was basically a split between them recommending the MC 10W-30 and the MC 15W-40. She decided to just keep using the 10W-30 since it seems to work well and she has not had any problems yet. Her truck has almost 55,000 miles on it and she changes oil every 5,000 miles.
Wayne