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Old 10-31-2007, 05:08 PM
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Join Date: Sep 2004
Location: Houston, TX
Posts: 106
Question How to perform the "de-oiling" process?

Folks, I'm considering running a citric acid flush on my 1983 300D before next summer, and a prerequisite to that is doing a "de-oiling". Does anyone have any information on either of these processes that they would like to share? I am aware that the citric acid crystals can be purchased from the dealer, but was wondering if anyone had any insights on whether or not these tasks were worth the time, or any other experiences they may wish to share.
Thanks so much!

1983 300D (Hans)
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Old 10-31-2007, 08:12 PM
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Join Date: Jul 2003
Location: Ocean Isle Beach, NC
Posts: 2,444
I feel that if your cooling system has been serviced regularly and the old coolant comes out nice and clean that you don't need to deoil or descale. But if you do decide that it needs it, I just used Liquid Tide to deoil. Some use Shout or liquid dish washing soap. Mercedes also sells their own product. I put about a cup of Tide in, filled it up and ran it. Can't remember if I drove it for a day or not but I at least got it up to temp and allowed it to circulate through the entire system. Then drain and flush well. Do the same with the citric acid.

'59 220S Cabriolet-SOLD and living happily in Malta
'83 240D 351,500 miles original owner-SOLD
'88 560SL 41,000 miles - being parted out
'99 E300 turbo 219,500 miles
'03 SLK320 40,000 miles - gave to my daughter
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Old 10-31-2007, 09:33 PM
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Join Date: May 2007
Location: Out in the Boonies of Hot, Dry, Dusty, Windy Nevada
Posts: 9,585
On the home page do a search in the google box under the Mercedes Shop button. type in de-oiling, citric acid flush.

there is a wealth of info on these subjects.

there were three HP ratings on the OM616...

1) Not much power
2) Even less power
3) Not nearly enough power!! 240D w/auto

Anyone that thinks a 240D is slow drives too fast.

80 240D Naturally Exasperated, 4-Spd 388k DD 150mph spedo 3:58 Diff

We are advised to NOT judge ALL Muslims by the actions of a few lunatics, but we are encouraged to judge ALL gun owners by the actions of a few lunatics. Funny how that works
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Old 11-01-2007, 12:20 AM
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Join Date: Nov 2006
Location: Boston
Posts: 2,040
I am doing this right now.

I used half a cup of powdered tide, dissolved in warm water and dumped it in. Ran car at idle, thermostat removed, for 30 minutes to circulate around. Oil certainly comes out, and I didnt have any oil in my coolant prior.

the best thread on the topic is titled 'If I have the dreaded green coolant...'


'85 300D, 'Lance',250k, ... winter beater (100k on franken-Frybrid 3 Valve Kit)
'82 300D, 'Tex', 228k body / 170k engine ... summer car
'83 300TD Cali Wagon 210k, wife's car
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