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  #1  
Old 05-10-2020, 12:54 PM
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Join Date: Jul 2003
Location: Ocean Isle Beach, NC
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Thoughts on coolant flush

I have religiously changed the coolant in the E300D every three years. This year marks the three years since the last time I did it. But the E300D has kind of been relegated to being a little used garage queen for the past four years or so. I've put 12,000 miles on it in three years since the last coolant service. I checked the coolant today and it is nice and clean, good to minus 30 and is giving me a reading of under 100 mv when I tested it with my multi-meter. It's got Zerex G05 and distilled water in the system now and keeps a nice steady temperature of around 165 to 170 when driving.

I was all set to do it, but after today's checks, I'm thinking it can easily go another year or more.

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Len
'59 220S Cabriolet-SOLD and living happily in Malta
'83 240D 351,500 miles original owner-SOLD
'88 560SL 41,000 miles - totaled and parted out
https://sites.google.com/site/mercedesstuff/home
'99 E300 turbo 222,500 miles
'03 SLK320 40,000 miles - gave to my daughter
'14 Smart electric coupe 22,500 miles
'14 Smart electric cabriolet 23,500 miles
'15 Smart electric coupe 21,500 miles

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  #2  
Old 05-10-2020, 04:02 PM
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Join Date: Aug 2008
Location: London, United Kingdom
Posts: 617
You mean a Citric acid flush? Highly recommended as a preventative measure. Worked wonders on my 1976 240D. Car heats up in 5 mins WITHOUT the blower on and the temperature never rises above normal, even in bumper to bumper.

Now, you've been diligent with your ownership, which really negates the need for the flush. If you see any white residue on any of your hoses, temperature fluctuations, leaks etc. then I'd consider it. Otherwise, leave things alone and keep those coolant changes going.
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  #3  
Old 05-10-2020, 05:20 PM
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Join Date: Jul 2003
Location: Ocean Isle Beach, NC
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No, I meant just a coolant change and maybe a light rinsing with just water. I haven't done a citric acid flush in awhile. Coolant has been coming out so clean and the system working so well that I didn't feel the need.
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Len
'59 220S Cabriolet-SOLD and living happily in Malta
'83 240D 351,500 miles original owner-SOLD
'88 560SL 41,000 miles - totaled and parted out
https://sites.google.com/site/mercedesstuff/home
'99 E300 turbo 222,500 miles
'03 SLK320 40,000 miles - gave to my daughter
'14 Smart electric coupe 22,500 miles
'14 Smart electric cabriolet 23,500 miles
'15 Smart electric coupe 21,500 miles

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  #4  
Old 05-10-2020, 06:50 PM
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Join Date: Aug 2006
Posts: 414
About 20 years ago I had a conversation with a fleet maintenance manager. His protocol for antifreeze was to annually drop the bottom rad hose and drain and refill with the appropriate coolant. Basically he said he was renewing just enough of the additive package to keep the system in tip top condition.

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1999 Mercedes E300TD daily driver sold at 238K miles 106K miles were mine, rust worm got it :-(
2006 Mercedes CDI new daily driver! 56,000 miles May 2016 now 85,625 Apr 2018 and Apr 2019 101,000 miles Apr 2020 109,875. July 2020 120,000 miles
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