Cooling system lasted about 15 years! :) - Page 4 - Mercedes-Benz Forum
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post #31 of 51 (permalink) Old 05-09-2019, 09:16 AM
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I lost the coolant pump somewhere around 200K miles. There was zero warning. No leak beforehand. It just sprung a massive leak suddenly on one of my trips and left me alongside the road in the middle of nowhere WV. I hit the magic SOS button and and 90 minutes later, they had my car on a flatbed hauler taking me to a dealership in Charleston, WV and had me back in business by the end of the day... and $1K lighter in my wallet if I recall. Would I replace the coolant pump with a coolant change? No, probably not if I'm doing a 5 year interval. However, after 15 years or 150K miles, it would be worth the trouble if I'm doing a coolant change, as the part is only $150. However, the hoses will cost more than the pump and you'd want to do the hoses after 15 years.
Hence the reason the water pump is a maitanance item and I replaced it at 174k miles.
GMB water pump $29 (Amazon warehouse)
E500 Valeo radiator $16 (Amazon warehouse)
Upper and lower E500 hoses $65 (Autohaus AZ)
Generic green coolant $12.

Double the cooling capacity: priceless
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post #32 of 51 (permalink) Old 05-09-2019, 09:19 AM
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.. Always keep in mind that a dealership DOES NOT want your car to run forever. They must sell new cars......
That's your theory.
The way I see, beside that sale and service are different departments, with today's cut-throat competition - sale department makes +- $1000 on sale commission.
That after spending big money to buy the car, maintain pristine showroom and free coffee + donuts for all the tire kickers.
Service dept on other hand can pocket tens of thousands in repairs on single car, that owner takes to them. They have to buy shop equipment, but no "dead investment" sitting on showroom floor.
Coming to coolant and reservoir change, aren't we splitting the hair over $20 or $40 expense every 15 years on vehicle who cost 70 grands to replace?
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post #33 of 51 (permalink) Old 05-09-2019, 10:47 AM
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The proper coolant now is equivalent to G-48. It is blue. The car came with G-05 equivalent, which is green. The additive packages are compatible, so the change over is easy. Keep in mind that the price for genuine Mercedes coolant is only about $5 higher than Zerex. And yes, it will go 150k miles or 6 years easy. Just change the reservoir.
Just one clarification to make. G05 is not green. It is a very light beige color. I just do want other owners to put the green stuff in which is not a spec coolant per MB.
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post #34 of 51 (permalink) Old 05-09-2019, 01:44 PM
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Taking about colors, the old MB fluid was yellowish, new one is blue and they can be mixed.
So from my kindergarten years I remember that yellow and blue make green.
Coincidentally cheap coolants on US markets are green, so I only wonder if mixed MB coolants make the same green.
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post #35 of 51 (permalink) Old 05-09-2019, 03:44 PM
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They do turn green when mixed, but not nearly as bright green as the good ol' green ethylene glycol that has been around forever.
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post #36 of 51 (permalink) Old 05-09-2019, 07:20 PM
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Just one clarification to make. G05 is not green. It is a very light beige color. I just do want other owners to put the green stuff in which is not a spec coolant per MB.
What's wrong with green coolant?
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post #37 of 51 (permalink) Old 05-10-2019, 05:24 AM
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What's wrong with green coolant?
It's been a while, but I think @Noodles is correct. The G-05 Equivalent wasn't green. I thought it was yellow, as I just put some in our Chrysler, but no matter, it definitely wasn't green. But I am sure the G-48 is blue, as I just put the new MB fluid in mine.

So the issue is you need to use the right coolant that is compatible with the HOAT additive packages in these engines, that is what is important. The latest MB cars use yet another coolant that is not compatible with the blue HOAT additives! So you don't want to accidentally put G-05 or G-48 in those cars. The G-05 and G-48 additives are compatible, so they can be mixed without repercussion according to Benz and the fluid manufacturers. I wouldn't mix them, but they say you can.

I'd suggest going out and Googling coolants and looking at the various additive packages and their evolution over the years, why they made changes and what the compatibilities are.
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post #38 of 51 (permalink) Old 05-10-2019, 08:22 AM
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Yes, Noodles is correct. I use Xerex G-05 in the '03 S430, and it's actually bright yellow. You can mix G-05 and G-48 and it does turn green (Kajtek is correct). However, if I see green in there, I don't know what it is, so I flush with distilled water and then refill with a 50/50 mix of either G-05 or G-48, whichever one's on sale. Both are correct for our cars, including the CDI's.

The Prestone-style bright green coolant that you get at the local auto parts store, for cars such as 1990's-era Honda Civics, Toyotas, and so on, is definitely *not* correct for our cars. Same goes for the Walmart brand of "generic for most cars" coolant; it's great in my Civics, but not for this era of Mercedes-Benz.
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post #39 of 51 (permalink) Old 05-10-2019, 09:12 AM
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What's wrong with green coolant?
Before I start driving MB, I had to replace radiators on 3 vehicles only becouse of build up the green coolant developed after few years.
Still remember $120 for Volvo radiator with lifetime guarantee 20 years ago.
Sweet times.
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post #40 of 51 (permalink) Old 05-10-2019, 01:33 PM
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The Prestone-style bright green coolant that you get at the local auto parts store, for cars such as 1990's-era Honda Civics, Toyotas, and so on, is definitely *not* correct for our cars. Same goes for the Walmart brand of "generic for most cars" coolant; it's great in my Civics, but not for this era of Mercedes-Benz.
Why not? What exactly is wrong with it? Is the Mercedes cooling system made out of some material that isn't found in any other car? Please explain.
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What's wrong with green coolant?
Before I start driving MB, I had to replace radiators on 3 vehicles only becouse of build up the green coolant developed after few years.
Still remember $120 for Volvo radiator with lifetime guarantee 20 years ago.
Sweet times.
That's odd. My 2 Volvo and 3 Mercedes use the same generic green coolant and never encountered any build up. Here's the inside 16mm radiator I just pulled from the E320. I don't see any green build up. Do you?
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