I have been searching for ZEREX G05 to no avail, however, I can find all the DEXCOOL I want. Is DEXCOOL suitable to use in my 300SEL (103) with a copper or brass radiator? It shows that it is OK to use where Daimler/Chrysler specs MS-7170 and MS-9769 are used.

Your best bet is to stick with original mercedes coolant. It's not that expensive. When it comes to your car the most vulnerable part is the aluminum cylinder head. Ive seen them corroded internally to the point of leaking coolant externally, as well as leaking coolant into the combustion chamber. Both are huge fixes compared to the cost of regularly changing your coolant with the proper stuff.

I recently purchased some MB antifreeze and the dealer told me that the price went DOWN (to only about 2x the cost of "ordinary" AF), probably due to the lower cost of oil. I don't think that there is any good reason NOT to use it on a car that you care about.

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86 560SL
With homebrew first gear start!
85 380SL
Daily Driver Project

http://juliepalooza.8m.com/sl/mercedes.htm

It seems that most places do not stock the Zerez G-05. We have NAPA auto parts stores in our area and they can get it. Ordered some a couple of months ago and bought 2 gallons for about $12.50 each. I suspect that any place that sells Zerex could order the G-05. This antifreeze is also approved by Mercedes - in fact I believe Zerex has made the MB brand for them since the '80s - just a different dye color in the Zerex labeled package. Zerex lists this as good for 150K miles or 5 years but I personally think it is still best to change it every 2-3 years for maxumum protection (freshness of additive package). Don't use the DEXCOOL! It has caused enough problems for GM and your car is not designed for this formulation.

Pep Boys stocks G-05 around here and NAPA can get it.

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Jim

Absolutely DO NOT use Dexcool with your type of radiator! I made that mistake a few years back in my older Toyota Pickup with a brass radiator and it quickly ate through the solder joints and ruined the radiator.

The best advice is to stick with the dealer supplied MB antifreeze, if you can't find any G-05. However, as long as you thoroughly flush your cooling system, just about any other type of antifreeze (except Dexcool) will be just fine. Just make sure you follow the change interval that is prescribed for that particular antifreeze.

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2000 c280 Sport (looks like an upgrade, feels like a downgrade)
1991 190e 2.3 (sold)

Go to Phil at Fastlane on the above banner. Get the correct antifreeze. Not too much more expensive, and peace of mind.
regards.
Mark