Hi folks.

Car in question is my wife's 2012 ML350, so I will also post in the ML350 section. Yesterday I changed the oil, air filters, fuel filter, and transmission filter and fluid. Today she drove it about 15 miles and it started shaking and losing power. We had it towed home and I had a little time to mess with it before dark.

No obvious leaks anywhere, so I took it for a drive. I got about a block and it did what she said it did. I stomped on it and it picked up very slowly and would not shift until I lifted up on the pedal. The engine is not revving like the trans is slipping, there is just no power, but it idles smooth and starts up normally.

The only anomally I had was yesterday when I drained the trans fluid out of it I got about 4.5 quarts out of it as measured by a measuring cup. So I refilled it with 5 liters of the proper blue transmission fluid. Now the transmission kit I got from ID parts came with two 5 liter jugs of fluid, but I only used one. 4.5 quarts = 4.25 liters

My questions....

First off, do you think I have a fuel problem or a transmission issue? Second what is the approximate amount of fluid needed for a drain and fill on a 722.9 transmission? Third, I drained 4.25 liters out and refilled with 5 liters. Is it possible the transmission still under filled, or overfilled (I don't see how .75 liters would cause this issue). Lastly, it first started after 15 miles of highway driving so the trans fluid was hot. Now it will do it after sitting for 6 hours and the fluid is cold.

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2012 Mercedes ML350 Bluetec 102K (hers)
2005 Corvette 55K (fun car)
2002 VW Jetta TDI 238K (mine)
1998 Volvo S70 T5 Turbo 211K (kids)
1994 Ford F150 4WD 246K (firewood hauler)
1983 Mercedes 300D 384K (diesel commuter)