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I went into MB of Walnut Creek to buy a case of mb229.51 spec oil this weekend.
The parts desk guy said he had never heard of this oil and tried to sell me the regular 5W-40. Funny given I have always bought the .51 oil there.

I told him that doesn't meet the spec - he checked with a tech who told him they use the 5W-40 all the time.
I asked him to order some for me - his boss called back yesterday and left a message that .51 isn't necessary.

Are these guys out of their minds or has something changed?

Also - quick poll - does anyone else's diesel engine burn a couple quarts every 5k miles?

Thanks,
 

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2009 GL320 - 2005 SL600 - 1989 260E - 1991 Allante - Old Jeep
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1 qt down @ 9,000 miles - changed @ 10k

1 qt down @ 19,000 miles - changed @ 20k


Never looked close at the Mobil 1 bottle that on the front says: For Turbo Diesel Trucks

Is this stuff up to spec?
 

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2007 GL450; 2012 E350 Wagon; 1995 E32000 SL500 sold sad!); 1999 CL500 sold sad;
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Why 229.51

The Mobil One 0-40M/e is specially formulated to account for a loss of lubricant additive, due to American (I believe) gvmt requirements to reduce some type of emissions. Also, it is formulated to lessen damage to the catalytic converters.

Diesel lube I am not clear on. But I would strongly recommend using a brand and part # of lube that meets the factory 229.51 spec for the CDI's. I think your manual provides and acceptable list.

I have two old design of 2-cycle Detroit Diesels on my boat and they clearly specify straight whgt oil with low ash. Obviously this is not the spec for your CDI, but I am saying that is there for a reason for any spec. E.g, in the case of my old DD's, it is to reduce wear in the cams area from high pressures and reduce ash buildup on the exhausts (old 2 cycles).

Get the 229.51 oil if at all possible.

P.s., I have 70k miles on an 06 R350 and it basically uses zero oil between 13k mile changes; maybe down 1/2 qt at that time. I use the Mobil One 229.51 0-40M(e).
 

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2006 E320 CDI, 2009 ML320 Bluetec, 2009 GL320 Bluetec
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1 qt down @ 9,000 miles - changed @ 10k

1 qt down @ 19,000 miles - changed @ 20k


Never looked close at the Mobil 1 bottle that on the front says: For Turbo Diesel Trucks

Is this stuff up to spec?
ABSOLUTELY NOT!!!

That oil (which is a GREAT oil by the way) is the WRONG oil for ANY engine with a DPF...you have a DPF!

Oil is always ingested by the motor by way of the turbo's compressor seals (they cannot provide a positive seal and rely on differential air pressure to seal in the oil). Anytime you are at idle you are leaking oil from the turbo into the intake system.

The additives in Non MB229.51 oils WILL CONTAMINATE the DPF. The issue is the Sulfated ash, Sulfated ash is a residual component of the additives in the oil that cannot be "baked" out during a DPF regen. The accumulation of these additives will eventually clog the DPF requiring it to be replaced.

If you have SCR (Urea) this too will be damaged by the sulfated ash and also require its replacement as well.

You must run the Mobil 1 5w40 ESP Formula M (0.6% Sulfated Ash). This oil is in my opinion one of the best oils out there! It's every bit as good as any of Mobil's top end 5w40 oils BUT without the Sulfated ash, so you get the best of both worlds!

Never run any oil that has the older MB229.5 specification. The Sulfated ash content was around 1.2% (double the limit).

In a pinch, the Mobil Delvac 1 ESP 5w40 is an alternative (1.0% Sulfated Ash) and meets the requirements of SCR/DFF equipped engines. Another option would be the Shell Rotella Synthetic 5w40, Double check but I think this also has a 1.0% sufated ash content.
 

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2005 G500, 1995 E300D, 1987 560SL, 1997 Porsche 993 C2S, 2011 LX570
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Always a lot of oil debate for the diesels here. I appreciate the informed responses that many of you make.

I recently changed the oil in our GL350 and purchased the correct oil from my dealer. With the MB Club discount, they charge me about $5 per quart. At that price, I won't bother with anything else. But you definitely have to ask for the discount, otherwise it is about $9-10 per quart.
 

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GL320 CDI - 2008, '04 Touareg V10 TDI, '85 Unimog U1700, '83 Mitsubishi 4WD turbodiesel PU
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As the OP stated: the dealer he talked to insisted on the 0W40! WRONG STUFF!! At $5/qt I'm suspicious that the oil purchased for your 350 is NOT CORRECT. Dealers parts folks are not always correct.
regarding the OP's question about oil usage - Drivebiwire gave the hint: at idle the engine will suck oil and with a boost pressure it will not. If you are using oil at more that a qt in 10K mi, you might want to try to cut down on the time the engine is idling.:)
 

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If you look closely you'll find a sticker on your radiator support forbidding use of ANY QUANTITY of oil that's not MB 229.51.

This means not a quart added between changes.
 

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2005 G500, 1995 E300D, 1987 560SL, 1997 Porsche 993 C2S, 2011 LX570
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Fourdiesel;

I assume the pics below are the correct oil? See the "net" price on the second photo. Closer to $6 per quart.
 

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2006 E320 CDI, 2009 ML320 Bluetec, 2009 GL320 Bluetec
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Thats the stuff! One of the best oils out there...and a good price too!
 

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GL320 CDI - 2008, '04 Touareg V10 TDI, '85 Unimog U1700, '83 Mitsubishi 4WD turbodiesel PU
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Fourdiesel;

I assume the pics below are the correct oil? See the "net" price on the second photo. Closer to $6 per quart.
You are correct - Mobil 1 ESP Formula M 5W40! Note that I said to "expect" to pay $11/qt. You got a deal and I don't usually pay that much either.:surrender:
 

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2005 G500, 1995 E300D, 1987 560SL, 1997 Porsche 993 C2S, 2011 LX570
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I won't let this thread die.

I was in Pep Boys yesterday and saw this! FYI for those whose dealers don't know what the oil is or charge too much for it. I will watch for Pep Boys sales.
 

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2008 GL 320, 2012 BMW X1, 1995 Volvo 855T, 2008 Outback
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I am hartened to see M oil being sold other than at the dealers.

My oil consumption is down to almost zero since I turned 20K miles. Initially it was quite high, about 1 quart every 3K miles. Usage slowed after 10K miles. Fortunately, I had a bad level sensor which would go off and remind me when the oil lowered 1/2 quart. The sensor was recalled, thank you.

Never use any oils that are not .51, never.
 
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