A8 shudder issues? - ZR-1 Net Registry Forums

wkndracr2 · 02-25-2021

I might relate an experience I had with first fluid change after initial track experience. I was unfortunate in picking a dealership two years ago that used an old, out of date fluid. The vehicle then developed the shudder. Now, after two more flushes/changes it may be getting better. Hopefully by now every dealership has the latest fluid and techs that understand our ZR1's require specific steps for successful fluid change.

lfalzarano · 02-25-2021

You may have to bring your own or specify exactly what fluid is required.

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Hib Halverson · 04-16-2021

In fact, your experience with the 8L90 fluid change to solve the torque converter clutch shudder problem, is rare but not uncommon because I have heard about other cases of dealers not flushing with the right fluid. Either dealers did not pay attention to what GM was telling them as far as how to "fix" the issue or they cut corners on cost by not buying the correct fluid.

Currently, the onlyfluid approved for use in the 8L90/8L45 is Mobil 1 Synthetic LV ATF HP.

02-25-2021	#1
wkndracr2 Join Date: Sep 2020 Location: N. Alabama Posts: 5	A8 shudder issues? I might relate an experience I had with first fluid change after initial track experience. I was unfortunate in picking a dealership two years ago that used an old, out of date fluid. The vehicle then developed the shudder. Now, after two more flushes/changes it may be getting better. Hopefully by now every dealership has the latest fluid and techs that understand our ZR1's require specific steps for successful fluid change.

02-25-2021	#2
lfalzarano Join Date: Feb 2011 Location: Clayton, North Carolina Posts: 1,133	Re: A8 shudder issues? You may have to bring your own or specify exactly what fluid is required. Sent from my iPhone using ZR-1 Net Registry __________________ Lou[COLOR="Red"][B][SIZE="4"][/SIZE][/B][/COLOR]

04-16-2021	#3
Hib Halverson Join Date: Jun 2005 Location: CenCoast California Posts: 899	Re: A8 shudder issues? In fact, your experience with the 8L90 fluid change to solve the torque converter clutch shudder problem, is rare but not uncommon because I have heard about other cases of dealers not flushing with the right fluid. Either dealers did not pay attention to what GM was telling them as far as how to "fix" the issue or they cut corners on cost by not buying the correct fluid. Currently, the onlyfluid approved for use in the 8L90/8L45 is Mobil 1 Synthetic LV ATF HP. __________________ Hib Halverson Technical Writer former owner 95 VIN 0140 current owner 19 VIN 1878