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  #1  
Old 01-07-2010, 03:33 PM
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92 S300 SD--Do I want this motor? (like the car)

The long term reliability of the 5 cylinder diesel up to 1985 is a wonder to behold... ! I know about these motors and that they will run and run. Had a couple!

A change in my home location and an ill colleague suddenly means I am needing to drive about 900 miles a week--180 miles a day with a not great back. The 92 S seats are really good for the old back (!) ... but the 6 cylinder motor--don't know enough.

I am seriously considering an S300SD with 127k miles. Exceptionally clean, good maintenance records and driven daily.

I have heard conflicting reports on the 92 300SD and its head gasket. Some say that once the new version head gasket is installed the motor will go well into 300,000 miles + ... others say if there are no oil leaks by now, it is reasonable to say, this car is not going to need the $2000 head job.

I would really love to hear from those who have experience with this 6 cylinder and/or who know about the motor. Your knowledge and help will be great appreciated about this motor.

Cheers, Grant
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  #2  
Old 01-07-2010, 03:40 PM
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Location: Blue Point, NY
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There is no such model as S300SD.

In the United States, there is was a 300SD in that model year. The engine is to be avoided unless one wants to take a $8,000. risk of a bent connecting rod.
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  #3  
Old 01-07-2010, 03:58 PM
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Quote:
Originally Posted by Brian Carlton View Post
There is no such model as S300SD.

In the United States, there is was a 300SD in that model year. The engine is to be avoided unless one wants to take a $8,000. risk of a bent connecting rod.
Brian,
It would be a help to probably several people (certainly me) to know the years, model numbers and bad engines (also by number please) of the vehicles/motors to avoid. can someone make up a list or a sticky?

Mr. Hunter?

Curiously enough, these seem to be associated with the tenure of Juergen Schrempp at the helm of MB, before he ran DBAG. Interesting.

Thanks!
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Invest in America: Buy a Congressman!

1950 170SD
1951 Citroen 11BN
1953 Citroen 11BNF limo
1953 220a project
1959 180D
1960 190D
1960 Borgward Isabella TS 2dr
1983 240D daily driver
1983 380SL
1990 350SDL daily driver alt
3 x Citroen DS21M, down from 5
3 x Citroen 2CV, down from 6
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  #4  
Old 01-07-2010, 04:04 PM
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Location: Blue Point, NY
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Quote:
Originally Posted by strelnik View Post
Brian,
It would be a help to probably several people (certainly me) to know the years, model numbers and bad engines (also by number please) of the vehicles/motors to avoid. can someone make up a list or a sticky?

Mr. Hunter?

Curiously enough, these seem to be associated with the tenure of Juergen Schrempp at the helm of MB, before he ran DBAG. Interesting.

Thanks!
The engines are:

603.970 in the 1990-1991 350SDL or 350SD.
603.971 in the 1992-1993 300SD
603.971 in the 1994-1995 S350D

Last edited by Brian Carlton; 01-07-2010 at 04:58 PM.
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  #5  
Old 01-07-2010, 04:25 PM
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Quote:
Originally Posted by Brian Carlton View Post

603.970 in the 1990-1991 350SDL or 350SD.
603.971 in the 1992-1995 300SD
Didn't the 1994 and 1995 models get the S350D designation?
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'82 300D Petrol B-G Metallic
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  #6  
Old 01-07-2010, 04:57 PM
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Originally Posted by techguy512 View Post
Didn't the 1994 and 1995 models get the S350D designation?
I think they did.

The list I have shows both designations for the '94-'95........probably the S350D is correct. Goes with the change to the chassis letter in front of the engine size.
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  #7  
Old 01-07-2010, 06:23 PM
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Join Date: Sep 2006
Posts: 298
Quote:
Originally Posted by Brian Carlton View Post
There is no such model as S300SD.

In the United States, there is was a 300SD in that model year. The engine is to be avoided unless one wants to take a $8,000. risk of a bent connecting rod.
I really liked the aesthetics of this Chassis and wish it were equipped with the "little engine that could" of yesteryear.
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This area is typically used to brag about one's current or former automobiles.
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  #8  
Old 01-07-2010, 10:53 PM
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Join Date: Nov 2004
Location: Nova Scotia, Canada.
Posts: 6,510
Quote:
Originally Posted by gbright View Post
The long term reliability of the 5 cylinder diesel up to 1985 is a wonder to behold... ! I know about these motors and that they will run and run. Had a couple!

A change in my home location and an ill colleague suddenly means I am needing to drive about 900 miles a week--180 miles a day with a not great back. The 92 S seats are really good for the old back (!) ... but the 6 cylinder motor--don't know enough.

I am seriously considering an S300SD with 127k miles. Exceptionally clean, good maintenance records and driven daily.

I have heard conflicting reports on the 92 300SD and its head gasket. Some say that once the new version head gasket is installed the motor will go well into 300,000 miles + ... others say if there are no oil leaks by now, it is reasonable to say, this car is not going to need the $2000 head job.

I would really love to hear from those who have experience with this 6 cylinder and/or who know about the motor. Your knowledge and help will be great appreciated about this motor.

Cheers, Grant
If the price was low enough you could drive it while locating the older three litre six cylinder and change the engine when/if it fails down the road.

Some people have built up good milage totals with no difficulty. In general this is not the case though. Also check if the car may already have a replacement engine from mercedes under the hood. Mercedes changed a lot of them. If not almost all.

The replacement engines fair a little better but the underlying problem was never really eliminated. The problem is non existant on the older three litre blocks .Basically the same engine casting with smaller cylinder bores.

When the 3.5 engine fails it is gradual failure with lots of warning it is underway. This allows you to do the engine change out on a less urgent basis. From the start of the problem until the engine will no longer run perhaps is a six month time frame on average.

This is just a very loose estimate depending on miles driven by the owner and others experience. Usually the resale price of a good example turns a blind eye to the problem. Or the person has been informed it is underway and dumps the car.

Last edited by barry123400; 01-07-2010 at 11:05 PM.
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