Some General Mercedes Diesel Questions... - Mercedes-Benz Forum

 
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post #1 of 6 (permalink) Old 01-18-2007, 05:17 PM Thread Starter
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Some General Mercedes Diesel Questions...

(1)Is the main differance between 190D,240D, and 300D, only the horsepower each has? I am looking at some early to mid 80 models in each of these. (2) All things being equal, such as year and quality and price, which would you purchase? I am a farmer/rancher, and am only familiar with diesel tractors as far as performance and longevity. (3) If I find one of these models in decent shape as far as appearance and repairs, how many miles is too many miles? Better to rephrase this, can a 200K-250K Mercedes still be considered a dependable vehicle? (4) What is normal, as far as oil consumption for these high mileage Mercedes I am referring to? Should there be any blowby in a 200K+ car? Is 1 qt per 1000 miles considered normal, 2qt per 1000 miles? I know the 190 D does probably get the better fuel economy over the 240D and 300D, which is one of my main focus points. I am not looking for a pristene vehicle, just one that can run 20-30 miles per day on parts runs to town, and get me in the 25MPG-30MPG range. Which would you recommend? Like I stated, I am a farmer/rancher, and am used to working on quite a bit of my own equipment, so doing some work on the diesel motors would not seem strange to me. I appreciate any comments and input you may provide.
Thank you,
coadman

ADDED> I have found a 1987 190D(2.5) with close to 300K miles on it. Looks to be in decent shape, and the currant owner has explained very thoroughly what he feels the pluses and minuses are of this car. I'd much rather find a car in this kind of condition, closer to the 200K mile range instead of 300K. Is this particular model known for going well over 300K miles? Thanks again, for any responses you may have!

Last edited by coadman; 01-18-2007 at 07:04 PM.
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post #2 of 6 (permalink) Old 01-18-2007, 09:36 PM
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The 240 and 300 diesels from late 70's and till 1985 are good for almost million miles. Or at least 600,000
I believe the 2.5 liter in 190D would give the same, but I am not familiar with those engines too much. From what I remember it is 35 MPG rated.
1 quart of oil per 1000 miles would be high, but might be "up to specifications".
Excessive blow-by is not a good sign. To better test the engine condition the compression test is needed.
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post #3 of 6 (permalink) Old 01-18-2007, 11:16 PM
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good idea

the 240s and 300s are good reliable cars, basic cars they use em as taxis. the 190s are good as well, great mpg, the earlier 84-85 2,2 has little that can break on the car, a good find, just dont overheat the engine, that is the only way to kill it. The 190 that you are looking at may be good, find out how much oil it burns for a tank of fuel, if its none or little, youre ok. If its half gallon youre fu8ked.
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post #4 of 6 (permalink) Old 01-19-2007, 03:56 AM Thread Starter
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Originally Posted by peoples28
the 240s and 300s are good reliable cars, basic cars they use em as taxis. the 190s are good as well, great mpg, the earlier 84-85 2,2 has little that can break on the car, a good find, just dont overheat the engine, that is the only way to kill it. The 190 that you are looking at may be good, find out how much oil it burns for a tank of fuel, if its none or little, youre ok. If its half gallon youre fu8ked.
Here's a quote from the owner, when I asked about any excessive oil usage...."I used to drive each week between Dallas and Austin, putting about 500 miles a week on it, and I think I'd add a quart of oil every month or two." He sent me some pictues of a couple of oil leaks, one I know should be solved by replacing the valve cover gasket. The other oil leak is coming from below the exhaust manifold. I'm not sure where the oil is coming from or what is required to aleviate that concern? I'm enclosing a couple of pics, so you guys can give me your opinion?
thanks,
coadman
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post #5 of 6 (permalink) Old 01-19-2007, 10:04 AM
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I have had the following diesels:

67 220d
76 240d
84 190d 2.2
87 190d 2.5 turbo
and currently an 87 300 dt turbo.

both 190d's fell to being rearended and totaled both were around the 250k miles and running great. The 240d was toooooo slow for my wife's car pool and was sold at 275k miles. All these cars got between 28 to 31 mpg and burned no oil between 3000 mile changes. The 300td will break 200k this month. It burns 1/2 quart of oil between 3000 mile oil changes but I only get 21.5 mpg.

With regular oil and filter changes these engines will run a very long time. I have had no problems with any of the engines or drive trains. Find a nice clean car and change ALL the filters and fluids. Than you can be a true diesel driver and keep you foot to the floorboard all the time. It's more fun to drive a slow car fast than to drive a fast car slow.
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post #6 of 6 (permalink) Old 01-19-2007, 01:23 PM
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Of those three choices, I'd get an '84-'85 300D. If forced, I'd consider a 240D only if it had a manual tranny. But to put my money where my mouth is, I'd buy the 1995 w124 diesel first - and I did.

- Brian



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