Quote:
Originally Posted by g300d
Interesting MB and Mobil recommend that, I hadnt known.
A Cx rating is a step in the right direction. Although I wonder why Mobil pushes the Euro 0w40 over Delvac 1 for this application, I see many recommendations for it from OM603 owners online, some proclaiming it the best oil even.
On the oil forums there is quite the differemce between HD and PC oils in general, but they do say smell and color is not much of an indicator of anything nowadays.
On the soot, from what I read I believe MB wants a max of 2% soot load on the oil and to change it out at that point, but newer oils can safely hold significantly more?
Also, about ZDDP...interestingly, most of the Cx spec have a lot of ZDDP in them. But...apparently there is 2 types of ZDDP, one commonly known for anti-wear, and the other for adhesion of oil to metal parts. Cx spec need lots of ZDDP because the detergents are counter productive to lubrication qualities. So yeah, lots of ZDDP but more of type 2 to make up for the detergents.
So right now I am not closer to having a clear preference lol...but I do know pretty much any modern rated oil will not cause any problems and will do fine.
Honestly, had an easier time zeroing in on an oil for the Legacy GT and CLS55 lol!
|
Just a hunch but I think another important thing to consider is that MB diesel engines have a few more things in common with their gas counterparts that typical HD truck diesels dont. For example, they are chain driven OHC high revving short stroke engines compared to the long stroke cam in block truck diesels that typically don't see more than 3000 RPM.
If you look at the gas engines, a lot of the design is similar and MB seems to design their oil specs to work well with both their gas and diesel engines.
Hmm I think I have convinced myself, i'm going to try a 229.5 spec oil in both my 617 and 603 next oil change.
01-15-2020, 01:40 PM
Linear Mode
