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The Porsche coolant incompatibility issues are fairly well known and documented, and as others have suggested can lead to a major league mess to try and clean up after it gels. But more to the point, the Porsche coolants have proven to be pretty good actors over the years. We have had Porsche cars come in with leaking water pumps that still had the OEM fill in them after 7-8 years and nearly 100,000 miles, and when tested (pH, freeze point, clarity, etc.) the coolant demonstrated it was still in amazingly good condition. We have seen similar behavior with cars that we had previously done Porsche coolant service on several years (4-6) ago that also test out perfectly. But other make cars that we also serviced using aftermarket coolant (that we mixed with distilled water, which is our standard practice) show signs of pH fall off and significant freeze point degradation after 3-4 years, indicating that the coolant is going to need to be changed soon.
Yes, the Porsche coolant costs a bit more than the stuff you can get at your local auto parts store, but experience has demonstrated it holds up extremely well over long periods when mixed with distilled water, a factor that could be a major consideration when you take into account what a pain in the butt a DIY coolant service on a Porsche can be for the average backyard mechanic, so it just might be a better value….
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“Anything really new is invented only in one’s youth. Later, one becomes more experienced, more famous – and more stupid.” - Albert Einstein
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