Buick Encore GX 2020–2024 — technical service bulletin
Bulletin 23-NA-122 · NHTSA communication 11023481 · issued May 9, 2025
Technical service bulletin
communication type
Engine
component
2020–2024
model years
11
vehicle entries
Official summary
This service bulletin provides a procedure to fix an oil leak from a porous area at the cylinder head and how to fix it so that the engine does not have to be replaced.
Vehicles covered
What a TSB means. Technical service bulletins are repair guidance manufacturers send to dealers — they are not recalls, and repairs are not automatically free (warranty extensions are an exception worth checking). The full document is available via NHTSA’s vehicle lookup.