Is CD/CF OK In My MB Diesel?

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Oldwolf

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This is a question about my 1993 2.5L turbocharged Mercedes Benz diesel (602.962).

Currently I use Delvac 15W40 in the summer because it seems to be one of the better non synthetic oils for diesels. Since my OCI’s are at 5k miles I think I am not pushing this oil too hard.

Winter is another matter. It doesn’t get real cold here in North Carolina. Occasionally it will dip into the upper teens.

I have been using Mobil 1 Turbo Diesel Truck in the winter. It’s a great oil but very pricey to me considering I practice 5k OCI’s.

This last change I decided a 10W40 would do fine so I made my own and blended 4 quarts of Mobil 1 Turbo Diesel Truck with 4 quarts of Delvac 1300 15W40.

Looking through my MB manual, it is stated that the engine required CD or CF rated motor oils.

My question is this…can I use Mobil Clean High Mileage 10W40 in the winter instead of my “winter mix” I mentioned above? It is CD/CF rated and recommended for diesels needing that specification.

I’m still kind of confused about using CI/CJ oils or if CD/CF’s are just as good in my engine.


Quote:

Mobil Clean High Mileage 10W-40 exceeds the warranty requirements for gasoline engines where a 10W-40 oil is recommended. It meets:

* API SM/SL
* The Requirements for Diesel-Powered Vehicles where API CF or API CD is Recommended


Thanks!
 
Last edited:
Actually it has been quite a while since CD became obsolete. It was a 1955 spec. Personally, if I lived in NC I would just use the 15w40 all year long.
 
+1 - Johnny

You can get the 5w40 for $27.99 at Advance Auto, 5 quarts and a Mobil 1 filter for the Benz or a different app.
Why consider the Mobil 1 10w40?
 
My sump holds 8 quarts and the engine uses a cartridge filter (about $8).

I am in the operating temperature range year round with 15W40 but I was thinking that using 10W40 would give me better cold start up lubrication on those colder days.

My last oil changes:

8 qts Delvac + filter: $29
8 qts Mobil 1 Turbo Diesel Truck + filter: $52
4 qts Mobil 1 Turbo Diesel Truck + 4 qts Delvac + filter: $42

The Mobil 7500 HM 10W40 is probably priced similar to Delvac 1300 so using it would lower the oil change costs quite a bit compared to Mobil 1 Turbo Diesel Truck.
 
If cost is an issue, a very good oil to run year-round would be Shell Rotella T synthetic. Its around $18/gallon, so you're talking order of $40/8 quarts - a bit cheaper than Mobil 1 Turbo Diesel Truck although more expensive than conventional Delvac.

Running year-round would let you push your OCIs out to nearer 10,000 miles since you don't have to dump your summer oil based on the calendar, so your overall savings would be even more. With an 8-quart sump size, 10,000 miles should be nothing for an HD engine oil like Mobil 1 Turbo Diesel Truck or Rotella T6.
 
What a joke! I asked Mobil the same exact question and they answered with this:

Quote:

Yes, that will be fine.


21.gif
 
Hi,
Oldwolf - You asked this question:
"My question is this…can I use Mobil Clean High Mileage 10W40 in the winter instead of my “winter mix” I mentioned above? It is CD/CF rated and recommended for diesels needing that specification."

The answer is yes if the viscosity conforms with the MB range for your ambient
 
So, I don't really gain any great advantage by using CH/CI rated oils over CD/CF oils in my diesel engine using 5000 mile OCI's?
 
Originally Posted By: Oldwolf
What a joke! I asked Mobil the same exact question and they answered with this:

Quote:

Yes, that will be fine.


21.gif



NO Joke! Mobil is qualified to make that call? As well as Doug?
 
Originally Posted By: Oldwolf
This is a question about my 1993 2.5L turbocharged Mercedes Benz diesel (602.962).

Currently I use Delvac 15W40 in the summer because it seems to be one of the better non synthetic oils for diesels. Since my OCI’s are at 5k miles I think I am not pushing this oil too hard.

I have been using Mobil 1 Turbo Diesel Truck in the winter. It’s a great oil but very pricey to me considering I practice 5k OCI’s.

Looking through my MB manual, it is stated that the engine required CD or CF rated motor oils.

No matter how old your MB diesel is, you should always use a quality diesel-rated motor oil.

Quality diesel-rated oils have a better rating than CD or CF. I would strongly recommend an oil rated CI-4 or better, winter or summer, and would never use anything less if that was my engine.

If Mobil 1 Turbo Diesel Truck is too expensive for you with 5k-mile oil change intervals, then see if you can't stretch that out to 7k-8k miles or maybe 10k. 10k miles is fairly conservative in our TDIs, and your 1993 MB should not generate a lot more soot than a TDI with mid-1990s technology.
 
Originally Posted By: Tornado Red
Originally Posted By: Oldwolf
This is a question about my 1993 2.5L turbocharged Mercedes Benz diesel (602.962).

Currently I use Delvac 15W40 in the summer because it seems to be one of the better non synthetic oils for diesels. Since my OCI’s are at 5k miles I think I am not pushing this oil too hard.

I have been using Mobil 1 Turbo Diesel Truck in the winter. It’s a great oil but very pricey to me considering I practice 5k OCI’s.

Looking through my MB manual, it is stated that the engine required CD or CF rated motor oils.

No matter how old your MB diesel is, you should always use a quality diesel-rated motor oil.

Quality diesel-rated oils have a better rating than CD or CF. I would strongly recommend an oil rated CI-4 or better, winter or summer, and would never use anything less if that was my engine.

If Mobil 1 Turbo Diesel Truck is too expensive for you with 5k-mile oil change intervals, then see if you can't stretch that out to 7k-8k miles or maybe 10k. 10k miles is fairly conservative in our TDIs, and your 1993 MB should not generate a lot more soot than a TDI with mid-1990s technology.


I agree with this. The detergent and dispersant and soot control adds are far better with HDEOs than PCMOs that are rated by obsolete specs. I assume that MB 229.3 was the spec at the time, but not sure youll find those. When I reviewed the 228.3 spec, I found it very familiar to 229.3, though 228 is a HD spec.

Id find a 228.3 oil, which really drives you to an HDEO.
 
For heaven's sake stop thinking about API specs like CD and CF. You have a MB engine, think ONLY in terms of MB specs. You need to completely ignore API ratings.
Use a 228.3, 228.5 (almost unobtainable in US), 229.3 or 229.5 oil. Reference p. 223.2 of
http://bevo.mercedes-benz.com/bevolistenmain.php?session_id=&navigation_path=&language_id=1
I use
http://www.mobil.com/Egypt-English/Lubes/PDS/GLEGENCVLMOMobil_Delvac_1_SHC_5W-40.asp
in my MB engine.
It is obviously very highly formulated but it happens to be API CF rated. I don't care about that at all, it has a MB 228.5 rating.
Use oil out of a bottle that has the proper MB rating!!!!

Charlie
 
Originally Posted By: m37charlie
For heaven's sake stop thinking about API specs like CD and CF. You have a MB engine, think ONLY in terms of MB specs. You need to completely ignore API ratings.


His Mercedes is out of warranty, so the oil he uses does not absolutely have to meet a MB or Daimler spec. There are many API-rated oils which are just as good. But the oil he used MUST be just as good -- which would eliminate any oil meeting only a CF spec and maybe a few gas-engine specs.
 
May I suggest with the Mobil 1 Turbo Diesel Truck oil do a used oil anaylsis because I would almost bet the oil can go way longer than the 5,000 miles. So lets say the oil lasts an easy 10,000 miles then the oil will be a bargain in comparison to the 5,000 mile oil change intervals. What I don't understand is people read all literature and believe every word about the greatness of syn oil. But the part about extended oil change intervals .
 
Originally Posted By: Tornado Red
. But the oil he used MUST be just as good -- which would eliminate any oil meeting only a CF spec and maybe a few gas-engine specs.


Please look at the oil I use.
Many 228.5 oils are "only" CF rated.
I don't like repeating myself, but the API rating is irrelevant.
My engine is out of warranty, I plan on continuing to use 228.5 oil when available. Most likely it will be "only" CF rated. Another example that is used fairly commonly outside the US:
http://www.epc.shell.com/Docs/GPCDOC_X_cbe_24855_key_140002137790_935.pdf
These oils may be "only" CF rated for the most minor of reasons, like not being formulated to pass the HEUI test (CG4 and higher). Which is irrelevant for MB engines since no MB engines use oil/hydraulically actuated unit injectors.
Since cost is an issue, I think he should use a MB228.3 oil, which means a good oil that is CI4+ rated. Note that 228.31 (CJ4) oils are NOT recommended for 6xx series car type MB diesels without DPF; unless they also have a 228.3 rating - which not all have.

Charlie
 
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