I recently changed my oil for the first in my used '03 7.3; after about 1200 miles, the oil is still clear and the crankcase is full. I used Mobil Delvac 1300 Super 15W-40 because it is the least costly to buy and it also conforms to the Ford oil specification for the engine. I will probably go with Mobil1 for Pickups and SUVs the next time; it meets the SAE standard of CI-4. It also comes in 5-quart jugs, exactly 3 of which are needed for the oil change. Shell Rotella T synthetic is another choice which also meets the API certification of CI-4Plus. I do not know what the "plus" means; I do know that the Delvac has the same ratings. Neither Shell nor Mobil specifically have the Ford specification, but both say that they (the suppliers) recommend their products for the Power Stroke.
Any responses or other suggestions?
Last edited by wiwaniuk : 09-24-2005 at 01:59 PM.
Reason: misspells