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Old 01-14-2010, 01:53 PM
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Interval for doing the citric acid/degreasing routine in 617 engine cooling system?

My engines: 617.952 (300CD-T, Calif.).

Does anyone happen to know if M-B ever had a recommended interval for doing the citric acid/degreasing routine in a 617 engine's cooling system?

For years, I had thought that it was every three to four years when the coolant was replaced. However, somewhere (don't remember where) a while back I read someone's opinion that at this interval, doing so was unnecessary and a waste of resources.

Anybody have a definitive answer for this one?


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Old 01-14-2010, 03:20 PM
Join Date: May 2002
Location: Blue Point, NY
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It's a waste of time and resources unless the drained coolant has really been neglected.............a gallon of rusty coolant from the block drain would give you the clue.
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Old 01-15-2010, 02:40 AM
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Radiator flushes sometimes loosen stuff that later plugs Radiators.
84 300D, 82 Volvo 244Gl Diesel
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Old 01-15-2010, 11:55 AM
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Location: Mount Holly, NC
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If you are talking about how to treat your car from new, then no, a citric flush is not needed if you perform the semiannual flush and refill recommended in the service manual.
if you are talking about repairing a neglected car that is having cooling system issues, it's best to start with a standard drain, and water flush, see if chunks of anything come out, and look for rust, or sediment in the block drain water. if this is found, then a citric flush may be warranted, but it can cause damage to a weak radiator/water pump, so prepare for more work if you start it...
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Old 01-15-2010, 12:55 PM
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Okay. Well, thanks for the insights.

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