Originally Posted By: Red91
I think I'm going to simplify things and run either Supertech or Travellers 15W-40. The Moly and Boron aren't as high as Delo or Delvac 15W-40, but the zinc, phosphorus, and calcium are nice, especially for a store branded oil that's often had cheap.
You probably can't do bad with that. BUT, consider this: head-to-head, the Supertech, has 2/3rds the Z and P of the M1 HM, and zilch Moly or Boron. It's got a much lower TBN (~ 12 vs 8). And it's
more expensive than the M1 HM at walmart after the M1 rebate for 5 quarts (10.88/5qts vs 9.44/gal). Couple that with the fact you can run the M1 longer an OCI, you save a fair bit with it. Plus, it's a lot more suitable as a year-round oil than a 15w. My car in my mild climate does not like 15w in the winter with 30F starts. There's a much bigger gap at lower those kind of temps with 10w vs 15w than the gap/difference 5w vs 10w. This is from an SAE paper using major brand (not disclosed) oils. Temps are in F:
In Alabama, or WA where I live, I'd put on a Fram tough-guard, Motorcraft, or similar filter and run the M1 HM 7,000 miles year-round in a healthy engine. I would not do that with any dino 15w-40.