For a while I was buying fluid at the dealer, which to be entirely honest if you get any kind of discount really isn't that unreasonably priced. But I started using Valvoline MaxLife in my 722.6s anyway because I had a few cars that needed serviced, and have tens of thousands of miles on several .6s with Maxlife in them over several years and have had no issues.

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68 280SL - 70 280SL - 70 300SEL 3.5 - 72 350SL - 72 280SEL 4.5 - 72 220 - 72 220D - 73 450SL - 84 230GE - 87 200TD - 90 190E 2.0 - 03 G500

Nissan GTR - Nissan Skyline GTS25T - Toyota GTFour - Rover Mini - Toyota Land Cruiser HJ60 - Cadillac Eldorado - BMW E30 - BMW 135i