General Motors has issued multiple technical service bulletins on torque-converter clutch shudder in the eight-speed, 8L45 and 8L90 transmissions.

This problem affects more than 4 million vehicles. That’s 11 different models across three different OE manufacturers between the model years 2015 and 2020.

GM’s solution to this problem is lengthy and complicated. It requires a full fluid exchange that uses 20 quarts of an expensive and very specific full-synthetic ATF.

You can avoid the expensive replacement of the OEM ATF by simply adding two 10-ounce bottles or 20 ounces of Lube Gard Platinum ATF Protectant.

This video is sponsored by LubeGard.