Equipment group 1SR, Premium II

Years 2012–13, 2015–16 Models 2 Factory citations 1

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Also described as Equipment group 1SR, Premium III

Also documented for Cadillac Chevrolet GMC

Documented applications

LaCrosse — Epsilon II, 2nd gen (2010–2016)

2012, 2015–2016 Factory-verified

FWD; replaced the CXS for 2012 (GM Authority 2012 RPO list); 2016: GM Authority 2016 changes

GM factory document — 2015 buick lacrosse fleet order guide wayback, p.1, p.2.
2013 Single-source

named Premium III until GM renamed it Premium II for 2013 (GM Authority 2013 changes); single-source for 2013: GM Authority 2013 changes does not credit GM

Regal — Epsilon II, 5th gen (2011–2017)

2012–2013 Confirmed

new for 2012, replacing the 2011 Turbo T05, T06 and T07 groups, printed TO5, TO6 and TO7 (GM's 2012 list); deleted for 2014 (GM's 2014 list)

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