OM606 Turbo Diesel - Same Story as Oldsmobile Diesel V8? - Mercedes-Benz Forum

 
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post #1 of 5 (permalink) Old 08-18-2011, 02:10 AM Thread Starter
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OM606 Turbo Diesel - Same Story as Oldsmobile Diesel V8?

Is it true that the OM606 turbo diesel as used in the S350 is in the same boat as the Oldsmobile diesel 5.7 V8, in terms of reliability?

The Olds diesel story is legendary: despite not being a 100% relation to the gas 5.7 "Rocket" V8, GM at the time needed a diesel small enough to fit in the same space as the gas version. The problems of the engine amounted to, among others:
1. The number of bolts for the diesel version being the same as to the gas version (the diesel version needed more stud bolts).
2. The original head bolts were not strong enough to withstand daily usage (this was eventually corrected; although the ARP aftermarket bolts are recommended nowadays).
3. The total lack of a factory-installed fuel-to-water separator.
4. Ironically, the 4.3 V6 version of this engine sold from 1982-85 was more reliable since it was based on the improved DX block of mid-1981, and had more head bolts per cylinder.

So, folks, how many surviving W140 series S350s are intact?

~Ben
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post #2 of 5 (permalink) Old 08-18-2011, 08:02 AM
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Look here to see how many w140 diesel members are on this site.
W140 S-Class - Benzworld.org - Mercedes-Benz Discussion Forum



1979 Pontiac Firebird 5.7- 86,142 miles
1981 Chevrolet Corvette 5.7
1984 Mercedes 190D 2.2 Auto - 140,628 miles
1987 Chevrolet Sprint 1.0 - 139,000 miles
1989 Oldsmobile Cutlass Calais S - 123,000 miles
1989 Chrysler New Yorker - 95,000 miles
1991 Dodge Stealth R/T - 101,000 miles
1999 Dodge Durango - 178,000 miles
2003 Dodge Dakota - 203,000 miles
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post #3 of 5 (permalink) Old 08-18-2011, 11:01 AM
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Originally Posted by MercedesFan1981 View Post
So, folks, how many surviving W140 series S350s are intact?

~Ben
Forty-two.

Felicita e un bicchiere di vino con un panino.
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post #4 of 5 (permalink) Old 08-18-2011, 01:13 PM
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I did own the Oldsmobile with the 350 diesel, Make it one wagon and 2 engines.
Than I was researching 350 diesels on MB.
The comparison is not even close.
While Oldsmobile diesel made bad impression comparing to gasoline counterparts making 200,000 miles, the 350 Mercedes engines look bad comparing to other MB diesels making 1 million miles.
So even the 350 MB diesel have bad reputation between MB diesel owners, they will outlast most of the other brands by long shot.
The main difference I guess is, that when my 350 Oldsmobile failed at about 80k, I got working replacement for $600.
The 350 MB engine is much more expensive.
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post #5 of 5 (permalink) Old 08-22-2011, 10:35 AM
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Quote:
Originally Posted by MercedesFan1981 View Post
Is it true that the OM606 turbo diesel as used in the S350 is in the same boat as the Oldsmobile diesel 5.7 V8
...

So, folks, how many surviving W140 series S350s are intact?

~Ben
Ben, you got your motor numbers wrong. The S350 has the OM603 in it. The OM606 was briefly shipped in the S300, then later in the G300 and E300. I have the latter two and they are bullet proof.

...Alan
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