Rustproofing, outside source, meets MIL standard 1223

Years 1998–00 Models 4 Factory citations 6

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Documented applications

Impala — eighth generation (2000–2005)

2000 Factory-verified internal

GM factory document — 2000 chevrolet impala rpo code list, p.1.

Lumina — second generation (1995–2001)

1998–1999 Factory-verified internal

GM factory document — 1998 chevrolet lumina rpo code list, p.1.
GM factory document — 1999 chevrolet lumina rpo code list, p.1.

Monte Carlo — fifth generation, W-body (1995–1999)

1998–1999 Factory-verified internal

GM factory document — 1998 chevrolet monte carlo rpo code list, p.1.
GM factory document — 1999 chevrolet monte carlo rpo code list, p.1.

Monte Carlo — sixth generation (2000–2007)

2000 Factory-verified internal

GM factory document — 2000 chevrolet monte carlo rpo code list, p.1.

This page aggregates every documented appearance of 1Z1 in the Chevrolet reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.