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Old 08-07-2002, 12:57 AM
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Mercedes Coolant mixed Prestone

My wife was driving the 300e last week when I was out of town. The low coolant light came on. She had the smarts to add antifreeze, but she did not know there was any difference between the MB coolant and Prestone.

She added about 1" of Prestone to the reservoir.

Will this mess up the the coolant? Should I drain it and replace with MB coolant, or not worry about it?

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Old 08-07-2002, 06:06 AM
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Join Date: Apr 2002
Posts: 3,469
The bigger issue would be to look into what caused the coolant tank to become low. There is really no reason for it to leak out. Make you have a hose with a pinhole in it, or the hose clamps need tightening. For now Id find out why, then I'd think about flushing the cooling system while your at it with MB coolant. The thing is Mercedes coolant is made for mercedes and it has a low acidity. Acidic coolant ruins engines.
No Benzes in the stable at the moment, but itching for one again.

Former Mercedes in the Stable:
1983 300CD Turbo diesel 515k mi sold
1984 300CD Turbo Diesel 150 k mi sold
1982 300D Turbo Diesel 225 sold
1987 300D Turbo Diesel 255k mi sold
1988 300 CE AMG Hammer 15k mi sold
1986 300E Amg Hammer 88k mi sold
1992 500E 156k mi sold
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Old 08-07-2002, 09:56 AM
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Join Date: Aug 2001
Location: At Sea
Posts: 1,729
1 inch of coolant in the reservoir hardly seems enough to trigger the coolant light. the sensor in the reservoir is known to be quirky. mine acted up this summer and i merly cleaned it and greased it with silicone grease. i don't think it's urgent to flush and refill your coolant but as omegabenz says i would look into why it was low in the first place.
1993 300e-2.8
- gone now <sigh>
"Do not adjust your mind, it's reality that's malfunctioning"
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