Replace the RDM lubricant with Dexron LS 75W90 (P/N 9986290). Bring the new lube up to operating temperature. Perform multiple figure eight or lock-steer maneuvers to work the lubricant into the clutch pack.
This bulletin applies to 2020-2023 Buick Encore GX vehicles equipped with an L3T engine and M3F transmission. When in AWD mode, a groan noise may be heard from the rear of the vehicle. This condition may be caused by a slip/stick of the clutch plates.
Make sure that the fluid is at operating temperature before draining by driving the vehicle in AWD mode. Replace the RDM lubricant with Dexron LS 75W90 (P/N 9986290). Bring the new lube up to operating temperature. Perform multiple figure eight or lock-steer maneuvers to work the lubricant into the clutch pack. Allow the vehicle to cool back to ambient temperature. If the moan/groan noise is still present, repeat these steps. This sequence may need to be repeated two to three times to reduce/eliminate the noise. If the concern is not resolved after three repeats, replace the RDM.
Mike Mavrigian has written thousands of automotive technical magazine articles involving a variety ofspecialties, from engine building to wheel alignment, and has authored more than a dozen books that crisscross the automotive spectrum. Mike operates Birchwood Automotive, an Ohio shop that builds custom engines and performs vintage vehicle restorations. The shop also features a professional photo studio to document projects and to create images for articles and books.
