- 1991 Factory-verified
GTZ with the LG0; the engine page names New Venture Gear as maker
GM Heritage factory kit — 1991 Chevrolet Beretta, p.7.
MU1 Factory-verified
Documented applications
This page aggregates every documented appearance of MU1 in the Chevrolet reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.