So, I'm due for a coolant flush. My car currently has the "green stuff" in it (from a radiator replacement two years ago). But, having read all the posts on coolant, it seemed to make sense to go with MB Coolant or Zerex G-05.

Was no small feat finding the Zerex, which I eventually did at a local Napa. But as I'm walking out of the store, the guy behind the counter made the comment that it is not advisable to switch from the green stuff to the Zerex (or similar) products because of chemical reactions/corrosion that will result. His contention was that, even if you flush the system, the metal parts have already reacted to the green stuff in such a way that, when replaced with Zerex, accelerated corrosion will result.

Granted, it's just some guy behind the counter. But it did unnerve me a little bit, so I thought I'd ask you guys.

Thanks.

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14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 159k miles
06 E320 CDI "Rutherford", Black on Tan, 179k mi, Stage 1 tune, tuned TCU
91 300D "Otis", Smoke Silver on Tan, 145k mi, wastegate conversion, ALDA delete

19 Honda CR-V EX 77k mi
Fourteen other MB's owned and sold
1961 Very Tolerant Wife

you should follow the advise about "citric flush" first. I belive a degreaser in the system first, then a good solid flush then the citric treatment, Then and only then, the G05
Good luck.

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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 560SL convertible
1987 190D 2.5-5SPEED!!!

1987 300TD
2005 Dodge Sprinter 2500 158"WB
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!

Is it necessary to do an acid flush even if there's no evidence of corrosion? Not to mention a new radiator...

__________________
14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 159k miles
06 E320 CDI "Rutherford", Black on Tan, 179k mi, Stage 1 tune, tuned TCU
91 300D "Otis", Smoke Silver on Tan, 145k mi, wastegate conversion, ALDA delete

19 Honda CR-V EX 77k mi
Fourteen other MB's owned and sold
1961 Very Tolerant Wife

No idea, it's just been my experiance to do it. gives everything a really good cleanover and removes any junk in the motor.
how old is the car in question? how long since last flush/fill? how long with Green in it?
your choice. but you did ask about the coolant problems...

__________________
John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 560SL convertible
1987 190D 2.5-5SPEED!!!

1987 300TD
2005 Dodge Sprinter 2500 158"WB
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!

PO always had it serviced at dealer, so I'm assuming it had MB coolant from 1992 to 2004.

It's had the green stuff for the last two years, since radiator was replaced (also time of last flush and fill).

__________________
14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 159k miles
06 E320 CDI "Rutherford", Black on Tan, 179k mi, Stage 1 tune, tuned TCU
91 300D "Otis", Smoke Silver on Tan, 145k mi, wastegate conversion, ALDA delete

19 Honda CR-V EX 77k mi
Fourteen other MB's owned and sold
1961 Very Tolerant Wife

If it's been two years, then time for a good system flush, drain and refill. Who added the green stuff? A MB dealer would not use it.

__________________
RRGrassi


70's Southern Pacific #5608 Fairmont A-4 MOW car

13 VW JSW 2.0 TDI 193K, Tuned with DPF and EGR Delete.

99 W210 E300 Turbo Diesel, chipped, DPF/Converter Delete. Still needs EGR Delete, 232K

90 Dodge D250 5.9 Cummins/5 speed. 400K

Gone and still missed...1982 w123 300D, 1991 w124 300D