Please help me buy a 300 Diesel - Page 2 - Mercedes-Benz Forum

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post #11 of 15 (permalink) Old 04-29-2007, 09:21 PM
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Diesels are something I have never thought about buying but there is a 300CD near me for sale so I might jump on that. Dnt like that knocking noise though
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post #12 of 15 (permalink) Old 04-29-2007, 10:40 PM
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The 350SDL "rod bender" at best is more than 50% likely to fail. They have a basic design flaw. By all means stay away from them. they give no warning of impending failure, but when they start to burn oil it is too late. Only a favtory replacement engine is worth the trouble

The spike in diesel Mercedes value is due in part to the interest in biodiesel and alternative fuel possibilities.

For the big sedans, probably the most durable and safe bet is actually the 1981-1985 300SD 5 cyl. turbo diesel with the cast iron block. Virtually indestructible, and on the greaqtr 126 chassis. The1986-1987 300SD 5 cyl turbo also are available in the SDL (4 inch longer wheelbase, more room in rear seats area) basically are the same car otherwise. The difference is they have aluminum manifolds on a cast iron block

Some of them had trap oxiders which could grenade and there is a factory recall for those, make sure it was performend on the car you are considering.

The smaller sedans on the W123 chassis are well within your budget, and from 1977-1981 are non turbo 5 cylinder diesels. From 1982-1985 they came with the turbo 5 cylinder diesels. They are very good and much loved cars, though I found their seats bouncier than the larger 126 diesels. TheCalifornia cars with trap oxidizers are the 1984-85 cars.

The newere body style smaller sedans came in 1986 and 1987 I think with the 300turbo diesel engine. Very good cars too, and the safety items of dual airbags and abs brakes make them a plus.

All are built to the highest standards, and had automatic transmissions.

Gray market imports sometimes had stick shifts but theywere pretty much imported into the USA only in the years up through 1985 and they are not thick on the ground.

Mileage is not a concern because the diesels run so long, but the cars arfe susceptible to rust, which should be your main concern as a buyer.

The 1986-87 W124 sedans tended to have wiring harness issues and ALL the cars of ALL years had airconditioning issues, so ALWAYS watch out for this.

I hope that helps a little bit. Try out the W123 and W124 sedans, and the W126 and see which you like best, then shop for what you like.

I avoided the mention of the 4 cylinder 240D, as I did not think you would be interested in them (1977-1985 W123) because they are 62 hp, and really slow, and while you could get them with a manual transmission, the automatic is even slower, and they are economical, over 30 mpg expected, they are bog slow zerro to 60 over 20 seconds and sometimes struggle up hills.
But they might be worth a look, they have a devoted following too, and are quality built cars that will last a long time too.

<--- superschnelle 300 hp 10:1 ECE euro HV, Hochverdichtung = high compression (11/2011) ... Wie im Freien Fall. Nur horizontal.

"I swear to god, it's like I live in a trailer of common sense, and stare out the window at a tornado of stupidity." >'='<
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post #13 of 15 (permalink) Old 05-04-2007, 06:53 PM Thread Starter
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Thank you, everybody, for your help.
I should have mentioned that safety is a major factor in this decision, and I need headrests in the back seat for the kids.
As far as I can tell, that's about '86-up.
I may have found a nice '91 300.
Post head-cracker, pre harness-eater.
We'll see tomorrow...
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post #14 of 15 (permalink) Old 03-29-2012, 05:22 PM Thread Starter
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I'm bringing this thread back to life because the car I bought has croaked!
Someone mentioned 86-88 cracking heads.
Is this common knowledge?
Anybody else have this experience?
I've found an '87 300D 6 cyl. that looks so nice.
Can anybody tell me about the 190s with 2.5 Diesel.
That must be the same engine as in my 300, right?
Just a different body style?
Thanks so much...
I'm in a total panic having to buy a new car!
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post #15 of 15 (permalink) Old 03-29-2012, 10:12 PM
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That really brings memories back
You are mixing several things together.
87 300d (non turbo?) is the one with aluminum heads that are prone to cracking per my memory.
The 2.5 l turbo has more kick, especially in lighter 190s
Than we are talking about 25 years old cars...

Last edited by Kajtek1; 03-29-2012 at 10:14 PM.
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