Alright folks let's all just try our best and make this a truly, "quick, simple" oil thread. No long discussions/arguments on anything oil related. Chances are, it would already have been done before (do a search).

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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