Don't ruin your modern diesel!




Still after reading about seized OM642 engines, what points to using older generation oils, I am religious about using 229.52 category only
If Mercedes didn't spec an oil that is CK-4 rated, its because they determined it doesn't need to be.
Simple as that!
Should/could it be used in non-mercedes diesels? Absolutely not unless they specifically list 229.52 oils.
https://mbworld.org/forums/diesel-fo...tec-om642.html
https://mbworld.org/forums/diesel-fo...tec-om642.html
One thing I always "thought" was true about oil ratings was that the oil company had to pay to get it tested to achieve the rating? IF that's true, then maybe Mobil hasn't just paid to get the CK-4 rating?
But... back to why I quoted your post, Tjts. I read through the post you linked to and I think you have your info confused. He did NOT say he used Mercedes spec oil... he said he used "Mobil 1 0W30 or 5W30". He did NOT say he used ESP or even an MB approved oil. Later on he said (after using Seafoam... which may help) he used the "recommended Mobil 1 5W-30 ESP" and currently has (had) about 90 miles on it.
Nowhere did he say he previously used the recommended oil. And nowhere did he say he is still having issues. Maybe he did and maybe he does - but HE didn't mention that - so what you're saying about this instance is only an assumption at this point.
I'm not saying any of that to knock you - just that it's good to NOT make assumptions. More info from the OP would be needed.




One thing I always "thought" was true about oil ratings was that the oil company had to pay to get it tested to achieve the rating? IF that's true, then maybe Mobil hasn't just paid to get the CK-4 rating?
But... back to why I quoted your post, Tjts. I read through the post you linked to and I think you have your info confused. He did NOT say he used Mercedes spec oil... he said he used "Mobil 1 0W30 or 5W30". He did NOT say he used ESP or even an MB approved oil. Later on he said (after using Seafoam... which may help) he used the "recommended Mobil 1 5W-30 ESP" and currently has (had) about 90 miles on it.
Nowhere did he say he previously used the recommended oil. And nowhere did he say he is still having issues. Maybe he did and maybe he does - but HE didn't mention that - so what you're saying about this instance is only an assumption at this point.
I'm not saying any of that to knock you - just that it's good to NOT make assumptions. More info from the OP would be needed.
https://www.mobil.com/en/lubricants/...il-1-esp-5w-30
ESP is a gasoline engine oil that MB decided was also ok to use in diesel engines because it simplifies inventory for dealer service dept and ensures that your engine will grenade before the DPF. Mission accomplished. It lacks the diesel engine oil additives that would otherwise be necessary to meet the industry standard API CK-4 for diesel engines. Mobil makes a 5w30 API CK-4 diesel oil. It is not the 229.52 ESP gasoline oil you love so much.
Only Mercedes is telling it's customers to put 229.52 ESP gasoline oil in diesel engines.
Last edited by tjts1; Jan 22, 2024 at 02:07 PM.
The Best of Mercedes & AMG




(I suspect it is a Russian hoax...)
You are a fück!ng moron. You've been using pure biodiesel and you have the audacity to whine about how the engine oil is somehow responsible for your engine failures?

Have you ever heard of a property called diesel lubricity and do you know what it is? In a nutshell, it indicates how "slippery" the fuel is, and thus how much fuel slips past the piston rings and ends up in the crankcase where it dilutes and oxidizes the oil.
What a tool.

/end thread.
You are a fück!ng moron. You've been using pure biodiesel and you have the audacity to whine about how the engine oil is somehow responsible for your engine failures?

Have you ever heard of a property called diesel lubricity and do you know what it is? In a nutshell, it indicates how "slippery" the fuel is, and thus how much fuel slips past the piston rings and ends up in the crankcase where it dilutes and oxidizes the oil.
What a tool.

/end thread.
Last edited by tjts1; Jan 31, 2024 at 04:05 PM.




Last edited by 300SE1993; Feb 21, 2024 at 05:09 AM.




Get yourself familiar with this site and check it before each service for updates.
Mercedes-Benz Operating Fluids




If any of this concerns you, use Chevron Delo XLE 10W-30 or Shell Rotella part 550046251 T6 Full Synthetic Multi-Vehicle 5W-30. Both meet the CK-4 spec as well as MB 228.51, which I expect is one of the specs listed for your engine.
My timing chain stretched at 50k miles (had it replaced at 60k miles) using that Mercedes recommended 229.51 Mobil 1 ESP oil every 10k miles. (one extra change at 5k miles when the car was new) Now the car was recalled and the entire emissions system has been replaced: new DOC and DPF, new SCR & catalytic converter new NOx sensors and a 4yr 48k mile warranty on a bunch of stuff. (including turbo, timing chain and most of the top end) This is all part of the EPA settlement against Mercedes for cheating the emissions similar to VW/Audi/Porsche.
The Mercedes and BMW Diesel oil is API SN so a gasoline engine oil. (without the appropriate protection for soot...etc)
I started using Shell Rotella T6 at 80k miles with ACI CK-4 and ACEA E9 (also motorcycle JASO MA/MA2) and will do an oil analysis now. The car is beautiful and runs perfect again after the timing chain replacement which was done at 70k miles. Keep it or sell it? Run the Mercedes recommended 229.51/52 oil or an approved API CK4/ACEA E9 oil. I don't trust Mercedes. Worst ownership experience.
Last edited by tjts1; Feb 27, 2024 at 12:05 PM.




The fact that an oil manufacturer claims that the product exceeds the quality requirements used by Mercedes does not mean that the engine manufacturer recommends its use.
There is a list of oils that MB recommends on the internet, someone will probably find it.




The specific oils from various oil manufacturers that have MB 229.52 approval are listed at https://operatingfluids.mercedes-benz.com/sheet/229.52.
P.S. Mobil1 oils are still approved for use - see the list above. Unlike with the API, it does not cost the oil manufacturers an arm and a leg to get the Mercedes approval... there is a nominal fee, but all they have to do is submit samples that pass the specific tests for said approval.
Last edited by Diabolis; Dec 15, 2024 at 09:55 PM.




