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I have a bad case of aluminum oxide contamination in my 98 Mazda 626's cooling system. While researching the subject, and filtration solutions, I noticed that this type of problem is very common among many diesel engines, to the extent that many come with coolant filters as standard equipment, and after-market coolant filtration solutions are widely available.

Why is this such a common problem among many diesel engines and what specifically causes it?

  • I have owned VW diesels since 1977, and have not had this problem. If aluminum oxide was in any quantity in the coolant, I would expect premature water pump failure. – mongo Apr 4 '17 at 16:23

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