Very interesting discussion that has provided a lot of food for thought. I was all set to do the partial flush using the VW/Audi fluid, but after reading these last few posts, I'm no longer convinced it's necessary, or even a good idea. Need to think on it some more...

Oh, and by the way, that link to "Sweet source for Esso" is very old, and it no longer works.

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2003 X5 4.4i
1992 Porsche 968
2007 328i
2014 Subaru Forester XT