I recently did a drain and fill using amsoil atf and I totally regretted it. This seems to screw up the tranny's shift logic (ASC, adaptive shift control). Normally, when I'm making a fast right hand turn, the tranny, even in
D mode, downshifts to the appropriate gear as I brake hard right before the bend, i'm guessing 2nd and holds onto that gear even w/o me stepping hard on the throttle.
But it stopped doing that and i see my revs drops below 2k rpm when I'm going tight turn fast. It only downshifts the moment i step hard on the throttle, upsetting the balance since it's going from being torqueless at 1k rpm to 4k rpm in an instant. DO you guys think I ruin some sensor or solenoid in the tranny by mixing thetranny oil. It seems it's hestitant to use 2nd gear. I notice, even on straight aways, it doesn't hold 2nd gear as long as before, shifting, jumping to 3rd gear before 2.5k rpm.
DS mode doesn't change the downshift behavior much, it still won't downshift going into a turn until i step hard on the throttle.

I later did a full flush w/ matic S but the shift logic still stuck in this convservative mode.

 

did you try resetting the ecu?

 

Thats wierd to have A transmission fluid flush mess up your computers timing.

It would be like doing an oil change and having your engine only fire 2 of 6 cylinders.

I vote to try an ecu reset or just disconnect the battery.

If you gears were not lubricated properly or you did not screw the drain plug on right i think you would have worse problems than just jumpy transmission logic.

Its sounds like more of a software issue. Not due to your fluid change.

Good luck..

 

sorry for being slightly off topic but since you got an 07' g35 AT... is the transmission covered by any plastic panel or is it fully exposed? also the AT have seperate fill plug or is dip stick tube the ONLY way to fill it? Thanks!

 

Pretty sure the only way to fill the trans is the dipstick tube. OP did u refill exactly the same amount of fluid that came out? I'll check the FSM when I get back home to see if there's any special procedure that should be done

 

yeah i got confused considering both diffs and transfer case as fill plug and drain plug.

regarding amsoil, im a big fan of it coming from evo world. i trust amsoil alot but considering all nissan doc states specifically for maticJ, i wouldnt risk otherwise.