Engine, gasoline, 8 cylinder, 8.1L, multiport fuel injection

Years 2001–07 Models 4 Factory citations 30

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Also described as Engine, gas, 8 cylinder, 8.1L, multiport fuel injection

Also documented for GMC

Documented applications

Avalanche — GMT800 (2002–2006)

2002–2006 Factory-verified

only in: 2500; Wikipedia (Chevrolet Avalanche) names the 8.1L L18 for the 2500 only

GM factory document — 2002 chevrolet avalanche 2wd rpo code list, p.1.
GM factory document — 2003 chevrolet avalanche 2wd rpo code list, p.1.
GM factory document — 2004 chevrolet avalanche 2wd rpo code list, p.1.
GM factory document — 2005 chevrolet avalanche 2wd rpo code list, p.1.
GM factory document — 2006 chevrolet avalanche 2wd rpo code list, p.1.
GM Heritage factory kit — 2002 Chevrolet Avalanche, p.54.
GM Heritage factory kit — 2003 Chevrolet Avalanche, p.119.
GM Heritage factory kit — 2005 Chevrolet Avalanche, p.122.

Express — GMT600 (1996–2002)

2001–2002 Factory-verified

GM factory document — 2001 chevrolet express rpo code list, p.1.
GM factory document — 2002 chevrolet express rpo code list, p.1.

Silverado HD — GMT800 (2001–2007)

2001–2007 Factory-verified

GM factory document — 2001 chevrolet chevy c silverado 2wd rpo code list, p.1.
GM factory document — 2002 chevrolet chevy c silverado 2wd rpo code list, p.1.
GM factory document — 2003 chevrolet chevy c silverado 2wd rpo code list, p.1.
GM factory document — 2004 chevrolet chevy c silverado 2wd rpo code list, p.1.
GM factory document — 2005 chevrolet chevy c silverado 2wd rpo code list, p.1.
GM factory document — 2006 chevrolet chevy c silverado 2wd rpo code list, p.1.
GM factory document — 2007 chevrolet silverado classic 2wd rpo code list, p.1.
GM Heritage factory kit — 2001 Chevrolet Silverado HD, p.62.
GM Heritage factory kit — 2002 Chevrolet Silverado HD, p.41.
GM Heritage factory kit — 2003 Chevrolet Silverado 2500, p.259.
GM Heritage factory kit — 2005 Chevrolet Silverado 2500HD, p.193.

Suburban — GMT800 (2000–2006)

2001–2006 Factory-verified

only in: 2500; Wikipedia (Chevrolet Suburban) names the 8.1L L18 as an option on the 2500 only, added in 2001

GM factory document — 2001 chevrolet chevy suburban 2wd rpo code list, p.1.
GM factory document — 2002 chevrolet chevy suburban 2wd rpo code list, p.1.
GM factory document — 2003 chevrolet chevy suburban 2wd rpo code list, p.1.
GM factory document — 2004 chevrolet chevy suburban 2wd rpo code list, p.1.
GM factory document — 2005 chevrolet chevy suburban 2wd rpo code list, p.1.
GM factory document — 2006 chevrolet chevy suburban 2wd rpo code list, p.1.
GM Heritage factory kit — 2001 Chevrolet Suburban, p.51.
GM Heritage factory kit — 2003 Chevrolet Suburban, p.38.
GM Heritage factory kit — 2005 Chevrolet Suburban, p.162.

This page aggregates every documented appearance of L18 in the Chevrolet reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.