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Old 02-16-2006, 02:17 PM
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Join Date: Sep 1999
Location: USA
Posts: 338
350 SDL Coolant Replacement Question?

I want to replace the radiator/engine coolant in my 1991 350 SDL and have a couple of questions:

1.What is the proper Mercedes type of anti-freeze to get?

2 .How much anti-freeze do I need?

3. Where exactly are the drain plugs that I need to use? Is it the blue plug under the radiator, are there block drains too? If so where are they?

4. Should I "back-flush" the system? If so what do I need for this?

Thank you.

Last edited by ezrider; 02-16-2006 at 03:53 PM.
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Old 02-16-2006, 03:28 PM
deerefanatic's Avatar
Diesel & John Deere Nut
Join Date: Jul 2005
Location: Sturgis, MI area
Posts: 849
Yes, there is the drain (blue) plug in the radiator, plus there should be a block drain on the engine too.

For antifreez, you have two choices, either MB coolant from the dealer, or Zerex G-05 (My choice). These are the only two certified for use in MB diesels. Don't cheap out on this, broken radiator parts are what you get from other stuff, and it just isn't worth it to shave $30 (if that) every 150,000 miles.......

EPA Section 609 Certified MVAC Technician
Oil Burner Kartel Member #10

Ahh the smell of Diesel Fuel, it's like coffee in the morning!

My Car:

1982 300SD Turbo Diesel (231,500 miles!) RIP

1984 300SD Turbo Diesel Custom (235,500 mi on driveline.) - On Road!!

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Old 02-16-2006, 03:36 PM
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Join Date: Jun 2005
Location: NJ
Posts: 1,182
Don't forget distilled or deionized water.

82 300D....went to MB heaven
90 350 SDL....excercising con rods
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