Engine, gas, 6 cylinder, 3.5L, sequential fuel injection, V6, offset bore, GM

Years 2006–09 Models 4 Factory citations 12

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Also documented for Pontiac Saturn

Documented applications

Impala — ninth generation (2006–2016)

2006–2009 Factory-verified

The 2007 order guide lists it as new for 2007, gasoline only, included with the California or the Maine, Massachusetts, New York or Vermont emissions.

GM factory document — 2006 chevrolet impala rpo code list, p.1.
GM factory document — 2007 chevrolet impala rpo code list, p.1.
GM factory document — 2008 chevrolet impala rpo code list, p.1.
GM factory document — 2009 chevrolet impala rpo code list, p.1.
GM Heritage factory kit — 2007 Chevrolet Impala, p.125.

Malibu — Sixth generation, Epsilon (2004–2008)

2007–2008 Factory-verified

the Pontiac G6 doc writes "gasoline" for the same list wording. shared Epsilon code.

GM factory document — 2007 chevrolet malibu rpo code list, p.1.
GM factory document — 2008 chevrolet malibu classic rpo code list, p.1.
GM Heritage factory kit — 2007 Chevrolet Malibu, p.28.

Malibu — Epsilon II (2008–2012)

2008–2009 Factory-verified

one 2009 list adds VVT after the fuel injection entry; the 2008 list does not.

GM factory document — 2008 chevrolet malibu rpo code list, p.1.
GM factory document — 2009 chevrolet malibu rpo code list, p.1.

Monte Carlo — sixth generation (2000–2007)

2006–2007 Factory-verified

Wikipedia names the 3.5 L as LZE only; LZ4 is on the 2006-2007 lists, which are the Impala lists word for word (controller to confirm).

GM factory document — 2006 chevrolet monte carlo rpo code list, p.1.
GM factory document — 2007 chevrolet monte carlo rpo code list, p.1.

This page aggregates every documented appearance of LZ4 in the Chevrolet reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.