always used MB af and distilled water (DW). A few months ago, I drained the radiator and while it was up on the hoist, I removed the bottom radiator hose. The interior of the radiator was plainly visible and it was as clean as new. No lime, calcium deposits.

However, as important as the use of MB af is, the most important is the use of DW. All modern af mixtures will support the use of tap water but if you really want to keep the coolant system clean through out its life, use DW!

The use of tap water degrades the length that you can keep the coolant from becoming an 'acid' because as the water breaks down, the 'protective' properties of the af get depleted. With DW, the time is increased and you can easily go 2 years before flushing.

Water Wetter has a rust inhibitor and provides added cooling for the engine. More info can be found on my web page, MENU#17.

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Regards . . . . JimF
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'94 S500 Cpe

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