Engine, diesel, 6.5L V8, turbo

Years 1998–00 Models 3 Factory citations 7

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Also documented for Chevrolet

Documented applications

Sierra — GMT400 (1988–2000)

1998–2000 Factory-verified

L65 prints the same wording

GM factory document — 1998 gmc gmc c pickup 2wd rpo code list, p.1.
GM factory document — 1999 gmc gmc c pickup 2wd rpo code list, p.1.
GM factory document — 2000 gmc gmc c pickup 2wd rpo code list, p.1.

Suburban — GMT400 (1992–1999)

1998–1999 Factory-verified

Wikipedia gives the 6.5L turbodiesel V8 (from 1994); L65 carries the same wording

GM factory document — 1998 gmc gmc suburban 2wd rpo code list, p.1.
GM factory document — 1999 gmc gmc suburban 2wd rpo code list, p.1.

Yukon — GMT400 (1992–1999)

1998–1999 Factory-verified

Wikipedia gives a 6.5L Detroit Diesel L56 turbo V8 for this generation

GM factory document — 1998 gmc yukon 2wd rpo code list, p.1.
GM factory document — 1999 gmc yukon 2wd rpo code list, p.1.

This page aggregates every documented appearance of L56 in the GMC reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.