15w40 Oil Quality

[blueoneton]

Not to stir the pot, but which of the leading 15w40 oil's are best for the 7.3? I have used MC 15w40, Rotella 15w40 and now Delo 15w40 in my 2002 F350. I know all the major brands are good, but are there any that are rated best?

 

[hheynow]

They all are rated CJ-4 but each has a different additive package and anti foam formula. IMO the best way is to try each oil and see how your truck runs on it, to see if one burns more oil than another and to have a UOA (used oil analysis) done. My truck prefers Delo 15W40.

 

[blueoneton]

My truck (2002 F350 7.3) also likes the Delo more than the MC or Rotella. On the 7.3 Forum, under the Rotella 15w40 at WM tab, it is mentioned the Delo is a semi-synthetic 15w40, I didn't know that.

 

[DaveBen]

15W-40 is not synthetic oil. Here is the Delo website: Delo - Engine Oils

Dave