Plant code, Oshawa 2, Ontario, Canada

Years 1999–09 Models 3 Factory citations 16

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Also documented for Chevrolet Pontiac

Documented applications

Century — W-body (1997–2005)

1999–2005 Factory-verified internal

the Oshawa plant code; lists print OST (letter O) and GM's corpus has no zero form

GM factory document — 1999 buick century rpo code list, p.1.
GM factory document — 2000 buick century rpo code list, p.1.
GM factory document — 2001 buick century rpo code list, p.1.
GM factory document — 2002 buick century rpo code list, p.1.
GM factory document — 2003 buick century rpo code list, p.1.
GM factory document — 2004 buick century rpo code list, p.1.
GM factory document — 2005 buick century rpo code list, p.1.

LaCrosse — W-body / GMX365 (2005–2009)

2005–2009 Factory-verified internal

plant code; the 2005 and 2006 lists abbreviate Ontario as ONT.

GM factory document — 2005 buick lacrosse rpo code list, p.1.
GM factory document — 2007 buick lacrosse rpo code list, p.1.
GM factory document — 2009 buick lacrosse rpo code list, p.1.

Regal — W-body (1997–2004)

1999–2004 Factory-verified internal

the Oshawa plant code; lists print OST (letter O) and GM's corpus has no zero form

GM factory document — 1999 buick regal rpo code list, p.1.
GM factory document — 2000 buick regal rpo code list, p.1.
GM factory document — 2001 buick regal rpo code list, p.1.
GM factory document — 2002 buick regal rpo code list, p.1.
GM factory document — 2003 buick regal rpo code list, p.1.
GM factory document — 2004 buick regal rpo code list, p.1.

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