Originally Posted by zeng
Originally Posted by Wolf359
This is a common mistake. MB 229.5 and 229.51 are TWO different specs. They spec 229.5 for gas engines and 229.51 and 229.52 for diesel engines. Because they have a 10k oil change interval, you're better off with a 229.5 oil than a 229.51 oil although you can use a 229.51 oil in a car that calls for 229.5. It's been covered multiple times in past threads.
I believe Mobil is actually the OEM maker of oil for Mercedes. Shell makes a bunch of transmission fluids you can use such as 236.14 and 236.15.
Check out the list of approved MB 229.5 fluids. You will not find the 229.51 fluids on there.
https://bevo.mercedes-benz.com/bevolisten/bevo-sheets-sort1.html
Here is another common myth/mistake on this board.
A 229.5 is meant for a MB gasoline engines ONLY , and it's
NOT for (light duty ) diesel engines (with modern emission systems) .
However, a 229.51 mid saps oils is always meant for a diesel engines,
AND gasoline engines.
While that's somewhat true, if you take your car to an MB dealer, they will only put MB 229.5 oil into a gasser and MB 229.51 or 229.52 into a diesel. Yes, you can use 229.51 or 229.52 in a gasser, but it's not ideal. That's why MB specs 229.5 still for gassers. MB 229.51 or 229.52 doesn't supersede 229.5. Whereas you can use 229.52 where 229.51 is called for. If you have a choice of oils, just use 299.5 oils in a gasser, it's not making it better by using 229.51.