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Mercedes 300SD #5455589 06/16/20 08:47 PM
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maverickfhs Offline OP
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Are these older Mercedes like 1985 300SD worth anything and fun to drive as an antique or a total money pit?

Rear wheel wells have rust, as well as some other small quirks and body shows it's age too.

Appreciate any insights thumbsup


2006 Civic EX 209K/AT
2006 Acura TSX 199K/AT
2007 Accord VP 154K/AT
Re: Mercedes 300SD [Re: maverickfhs] #5455599 06/16/20 08:55 PM
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eljefino Offline
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They'll run and drive with a real minimal amount of effort, but take tons of money to get absolutely perfect.

They are definitely fun in their own way. If half the stuff works it'll be cute and quirky.

Stuff like fuel filters and brakes are readily available and cheap. The diesel engine is legendary and typically you find these out of tune and in need of valve adjustments and other fiddling.

Re: Mercedes 300SD [Re: maverickfhs] #5455667 06/16/20 10:45 PM
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splinter Offline
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Originally Posted by maverickfhs
Rear wheel wells have rust
RUN!

But not too fast or it'll never catch you.
And turn off A/C whilst crossing intersections from green light getaway.


PUP 0W-40
Total Quartz 5W-40
M1 5W-50

Past performance is no guarantee of future results.
Re: Mercedes 300SD [Re: maverickfhs] #5455700 06/16/20 11:39 PM
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joegreen Offline
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I have an 84 300d. It's pretty slow but very cool. The suspension is soft and it's fun to bomb around in. I imagine an SD will be even slower but these engines were never about speed anyway. There is a line that goes from the intake manifold to something called the alda I think? It gets plugged with soot and can limit fueling and therefore performance. Rust is definitely something to look out for. Inspect the sun roof drains, drains in the engine cowel, behind battery for rust, jack points ect. 1985 model may have different turbo and transmission than earlier years I'm not sure. I'm only talking from w123 chassis experience. How many miles and how much money? On the plus side I always got 25-30mpg hand calculated.

Last edited by joegreen; 06/16/20 11:40 PM.

1978 Chevrolet k20
Engine: Delo 10w30xle
Transmission: Castrol transmax dex/merc

1984 Mercedes-Benz 300 turbo diesel
Engine: Delo 400 15w40le
Re: Mercedes 300SD [Re: maverickfhs] #5455905 06/17/20 08:55 AM
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JHZR2 Offline
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W123 and W126 are great cars. The pre-1985 cars are probably the longest-lasting vehicles on the road.

I wouldnt hesitate to drive my 81 240D or 82 300CD across country tomorrow.

The W126, like yours, is kind of the epitome. The W126 chassis is a little bit newer, offers some better capabilities over the w123, and still has the OM617 engine. Granted, the 85 617 engine has a few nuances like the Klima relay and a different tach sensor approach... i.e. a few very simple computers...

These vehicles were made very strong and with good steel, but they didnt have the rustproofing that newer vehicles have. So rust can be quite common. Sometimes it is repairable, depending upon where it is located. Sometimes it is expensive. But this is the case for any car, from any manufacturer. When rust shows, you need to cut out and weld in new metal.

The W126 did have issues with rust around the rear windshield seal. Rust will form there. Rust will also form in wheelwells like any other car. If seals are bad, rust can form from in the trunk too.

Re: Mercedes 300SD [Re: maverickfhs] #5455922 06/17/20 09:11 AM
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supton Offline
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How is parts available at typical stores? Say what you will, but if you're going cross country, waiting for mailorder is a bit of a hindrance. Even if you buy the dimestore caliper/hose/whatever only to replace it when you get home with the proper part, that is still better than being stranded.

What's the definition of fun? For some, just cruising along at low speeds is fine, others are expecting razor sharp handling and space shuttle acceleration. Gotta have metrics here--and, if I'm not mistaken, these cars were slow in their day--let alone today.


2011 Toyota Camry, base, 2.5L/6MT, 206k
2010 Toyota Tundra DC, 4.6L/6AT, 160k
2003 CRV, 2.4L/4AT, 161k
1999 Toyota Camry LE, 2.2L/4AT, 225k
Re: Mercedes 300SD [Re: maverickfhs] #5456222 06/17/20 04:22 PM
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maverickfhs Offline OP
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Yeah, was tempting but after reading about it guess will have to pass frown


2006 Civic EX 209K/AT
2006 Acura TSX 199K/AT
2007 Accord VP 154K/AT
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