PeachParts Mercedes-Benz Forum - View Single Post - 15W40 Vs. 10W40 Pro's/Con's, Which ones BETTER?

tobybul · #45 09-08-2006, 06:43 PM

If it were my car, I would not put 15w40. I would stay with 10w40. I use 5w30 on my 96C220 year round... and actually on all my gas cars. I reserve the 15w40 to the diesel.

The higher the numbers, the heavier the weight of the oil (less viscous), the engine works a bit harder. The lower numbers generally are thinner oil.

I have used only 5w30 for many years now and cars have been fine.

As to brands, I don't get to hung up on them. All have to meet specs and standards. Pretty much all say they meet or exceed bla-bla-bla standards. I saw Tractor Supply Co this week have 15w40 on sale for under $7 for 4qt container and I picked a few.