Good news indeed as I already stated. However I share Brian's concerns. 40,000 miles isn't quite enough to cause such a problem... at least typically. I wish you had collected a sample of that old transmission fluid to send off for an analysis. I hope your transmission isn't wearing out abnormally fast.

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1999 Mercedes-Benz S600, 103K miles - garage queen
1988 Mercedes-Benz 560SEL, 89K miles - daily driver
2007 Hyundai Sonata Limited, 31K - daily driver