Originally Posted by Cody M
I say if it's the right viscosity then who cares what oil you use in your car. It's not going to hurt the car but I'm like Oledoc2u and use the mobil 1 0w-40 since it has done me no wrong either.
The oil viscosity doesn't matter.
All that matters is that the oil meets MB oil spec 229.3 or 229.5.
This can be the all too familiar Mobil 1 0W-40, or several 5W-40, or even quite a few 5W-30 oils. If you look at the links I provided on the previous page, there are even other oil viscosities that you can choose from, if you can find them.
And there are plenty of oils that meet the viscosity that don't meet the spec.
Royal Purple's 0W-40 and 5W-40 don't meet the spec.
Is that because the oil is worse, or that they didn't send their oil to MB for testing?
I don't know the answer to that.
I think its just that they don't want to pay for actual testing of their oils.
BC.