Originally Posted By: Red91
I think I'm going to simplify things and run either Supertech or Travellers 15w40. The Moly and Boron aren't as high as Delo or Delvac 15w40, 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 Mobil 1 High Mileage, and zilch Moly or Boron. It's got a much lower TBN (~ 12 vs 8). And it's
more expensive than the Mobil 1 High Mileage 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 Mobil 1 High Mileage 7,000 miles year-round in a healthy engine. I would not do that with any conventional 15w40.