BenzWorld Junior Member
Date registered: Dec 2013
Vehicle: 1991 300SE, 2015 ML350
Mentioned: 0 Post(s)
Quoted: 4 Post(s)
I'll share my sizeable research and actual experience with my 2015 ML350 tranny.
My car DOES NOT have the start-stop option, but it DOES HAVE the auxiliary fluid pump mounted below the torque converter! Weird.
This pump will have to be removed to gain access to any holes in the bellhousing for reaching the torque converter drain. I haven't removed this unit - yet.
However, after a long search, I found only one guy who tried to drain the converter (on a 2012 ML350) and he was absolutely unable to reach thru the too-small hole in the bellhousing and access the drain plug, which did exist but was mounted at an angle making access with an allen wrench virtually impossible for him.
I looked up photos of used 2011-2015 ML350 transmissions and did confirm that the access hole is VERY small and mis-located in relation to the converter drain plug. Seems, as he concluded, the only way to remove the plug would be via access to a larger hole on the upper rt side of the bellhousing at about 10:00 o'clock. It's no piece of cake to reach either. Then rotate the engine, drain it, rotate it back up and try to get the plug back in. OUCH.
After seeing this mess, I concluded that no dealer would EVER try to drain the converter on this model.
Reports herein of using 6 qts fluid seem to confirm this. That's just the qty I used draining the pan only.
Maybe they could do a flush through the lines, but can't find any confirmation that a dealer ever has.
So, for now I opted to change the pan fluid and filter at 40k instead of waiting to 75k. Hopefully before I reach 75-80k and face decision time again, more data will surface about the mysteries of the undrainable torque converter plug on the w166 ML350.
Now to figure out how to change the unreachable spark plugs!!!!!!!
I hate this car already.