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Just got finished replacing the oil in my M5 Fluid Drive…after 12 years. Unfortunately, when I first got my Chrysler New Yorker, I installed the “slightly” wrong oil; “Mobil DTE 24 Hydraulic …. should have been “Mobil DTE Oil Light Circulating Oil” - manuf. part number 104743. Mobil’s naming scheme is confusing, however my mistake allowed me to compare both blends. The DTE 24 has additional additives, but IMO, was more "slippery" and didn’t accelerate the car as quickly as the DTE Oil Light Circulating 104743 -- while not fast, I’d say that it’s much more “sprightly”. The only downside is that the DTE Oil Light comes only in 5 gallon pails…. and it ain’t cheap….I found it locally for about $100…well, at least I’ve got a 30 year supply…. A few observations: - the fluid coupling of an M5 takes exactly 25.5 cups or 6.375 quarts. - instead of using a rag to keep the plug from falling into the bell housing, I used a thin piece of aluminum sheet to make a tube that fit in the fill hole.... left more room for the socket wrench. - make sure the car is level. On my first refill years ago, didn’t realize the gentle slope of my street… under-filled the coupling by 3 cups. This time I used a level and jacked the back end. - a DIY slow drip system is a lot less fatiguing, allows you to walk away while it’s filling…see photos. - Jame Douglas deserves a round of applause for his research into the correct oil for our Fluid Drives, he got it right. David in Santa Cruz