I have the A4S270R (GM) transmission with about 113K miles on it. I'm working towards doing an ATF change in the spring. From what I can tell, there are two pans on the transmission (one without drain /fill holes). I have read that some take this off and fill it with new ATF then use a floor jack to hold in place to put back on. Is this necessary - or will that be taken care of by several fluid changes over months?
What I plan to do (please chime in if something doesn't make sense here)
1. Drop the larger pan, change gasket and filter - do the usual to make sure it's filled properly at temperature with motor running / in park.
2. Drive for 500 miles or so
3. Repeat 1.
4. Drive for 500 miles or so
5. Repeat 1 with a BMW filter. Do the DIY gentle flush (using the to / from lines at the tranny fluid cooler as detailed here. I'm going to use Liqui-moly Tec 1200 ATF for this last one. The others will be done with Dexron whatever (probably the castrol 'for imports' stuff).
The extent of what I do will depend on what the fluid looks like, and how much sludge is in the pan when I do the first mini-change. I want the consistency to change slowly so that the tranny 'adapts' to the fluid as the viscosity changes. If the fluid is relatively clear (lifetime, hah!) or minimal sludge, then I may skip steps 3 and 4 and go right to 5 after about 500 miles.
the way I look at it, the tranny is 17 years old - even if with relatively low mileage. It also has not been 'drive it like you stole it' for most of its life. What I have read from owners and heard from BMW techs, it seems that the 'lifetime' is a not longer if the tranny hasn't been put through a race grinder (d-uh). If there is some minor piece of sludge keeping the whole thing working - then so be it. I've decided to accept that risk against having the piece of mind of nice clean and filter down there.
Cheers.
What I plan to do (please chime in if something doesn't make sense here)
1. Drop the larger pan, change gasket and filter - do the usual to make sure it's filled properly at temperature with motor running / in park.
2. Drive for 500 miles or so
3. Repeat 1.
4. Drive for 500 miles or so
5. Repeat 1 with a BMW filter. Do the DIY gentle flush (using the to / from lines at the tranny fluid cooler as detailed here. I'm going to use Liqui-moly Tec 1200 ATF for this last one. The others will be done with Dexron whatever (probably the castrol 'for imports' stuff).
The extent of what I do will depend on what the fluid looks like, and how much sludge is in the pan when I do the first mini-change. I want the consistency to change slowly so that the tranny 'adapts' to the fluid as the viscosity changes. If the fluid is relatively clear (lifetime, hah!) or minimal sludge, then I may skip steps 3 and 4 and go right to 5 after about 500 miles.
the way I look at it, the tranny is 17 years old - even if with relatively low mileage. It also has not been 'drive it like you stole it' for most of its life. What I have read from owners and heard from BMW techs, it seems that the 'lifetime' is a not longer if the tranny hasn't been put through a race grinder (d-uh). If there is some minor piece of sludge keeping the whole thing working - then so be it. I've decided to accept that risk against having the piece of mind of nice clean and filter down there.
Cheers.
Does anyone drop the small sump /pan in an automatic ATF change?
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