PeachParts Mercedes-Benz Forum - View Single Post - Mixing Dino Oil and Syn to Make Syn Blend, Good Idea?

greasybenz · #14 01-28-2007, 10:32 PM

i had just bought mobil 10w30 synthetic blend for $1.99/quart at kragen. Im planning to use it in the S420 once the next oil is due for a change, currently it has mobil 1 5w30.

It seems as though the car gets better mileage with a synthetic. And this was the same with my diesel. Back when i had the 300SD i used delo 400 15w40, performance wise it was the same clackity ol diesel. But when i switched the the 5w40 synthetic my mpg's went up and the cold starts were better.

Id say the best choice would be either a full synthetic or a synthetic blend. But a synthetic blend that wasnt done by mixing two different oils even if they were both of the same weight and brand.