Duramax Allison Transmission Fluid Castrol TRANSYND 668 SYNTHETIC
This is the prefered tranmission fluid to be used in your 2001-2019 Duramax that has a Allision Transmission. To drain and refill your Allison transmission fluid, you will need roughly 2.5 gallons. These are sold in 1 gallon jugs, so you will need x3.
We sell the filters as well. Select if you would like those.
If adding an EPC fooler on your 11-19 LML/L5P, we also stock those and can be found HERE