Equipment group 1SL, Essence

Years 2012–27 Models 10 Factory citations 25

Also described as Trim group, Enclave EssenceEquipment group 1SLEquipment group, AvenirEquipment group 1SL, Sport TouringEquipment group 1SL, LeatherTrim group, Verano Leather Group

Also documented for Cadillac Chevrolet GMC

Documented applications

Enclave — C1XX (2018–2024)

2018–2024 Factory-verified

Essence (FWD and AWD): S; the entry trim from 2022; shown in the guides' trim headings; 2019–2021, 2024: GM Authority

GM factory document — 2018 buick enclave fleet order guide wayback, p.1.
GM factory document — 2022 buick enclave order guide copy nhtsa docket, p.1, p.2, p.3.
GM factory document — 2023 buick enclave order guide copy autoevolution wayback, p.1, p.2, p.3.

Encore — Gamma II (2013–2022)

2013–2014, 2018–2019 Factory-verified

2013–2014: Leather (NICB: Leather Group); 2018–2019: Essence; GM Authority's 2021 changes page says Essence was dropped for 2021

GM factory document — 2013 buick encore fleet order guide wayback, p.1.
GM factory document — 2014 buick encore fleet order guide wayback, p.2.
GM factory document — 2018 buick encore order guide copy gm authority, p.1.
GM factory document — 2019 buick encore order guide copy gm authority, p.1.

Encore GX — VSS-F (2020–2027)

2025–2026 Factory-verified

trim group heading of the Avenir columns (FWD and AWD)

GM factory document — 2025 buick encore gx fleet order guide, p.1.
GM factory document — 2026 buick encore gx fleet order guide, p.1.

Envision — D2XX, imported from China (2016–2020)

2017–2020 Factory-verified

front- and all-wheel drive (4XS26, 4XZ26); the 2017 guide and GM Authority's 2017 page call it Leather; 2020: GM Authority's Espresso Metallic article

GM factory document — 2017 buick envision order guide copy gm authority, p.1.
GM factory document — 2018 buick envision order guide copy gm authority, p.1.
GM factory document — 2019 buick envision order guide copy gm authority, p.1.

Envision — E2XX (2021–2027)

2025–2027 Factory-verified

column heading of the full guide; GM Authority names the same three groups

GM factory document — 2025 buick envision fleet order guide, p.1.
GM factory document — 2027 buick envision fleet order guide, p.1.

LaCrosse — E2XX, 3rd gen (2017–2019)

2017–2019 Factory-verified

GM factory document — 2017 buick lacrosse fleet order guide wayback, p.1.
GM factory document — 2018 buick lacrosse order guide copy gm authority, p.1.
GM factory document — 2019 buick lacrosse order guide copy gm authority, p.1.

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

2012, 2015–2016 Factory-verified

FWD and AWD; replaced the CXL for 2012 (GM Authority 2012 RPO list); LFX standard on FWD for 2016 (GM Authority 2016 changes)

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

took the 1SN content for 2013 (GM Authority 2013 changes); single-source for 2013: GM Authority 2013 changes does not credit GM

Regal — E2XX (2018–2020)

2018–2019 Factory-verified

Sportback models 4ZY68 FWD and 4ZH68 AWD; TourX model 4ZY35 AWD

GM factory document — 2018 buick regal sportback fleet order guide wayback, p.2.
GM factory document — 2018 buick regal tourx fleet order guide wayback, p.2.
GM factory document — 2019 buick regal sportback fleet order guide wayback, p.1.

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

2012, 2014, 2016 Factory-verified

new for 2012, replacing the 2011 RL1 and RL2 groups (GM's 2012 list); new model code lineup (GM's 2014 list); the Regal 1SL column of the 2016 guide, FWD and AWD 2.0L turbo; the FWD turbo 1SL is deleted for 2017 (GM's 2017 list)

GM factory document — 2016 buick regal order guide copy gm authority, p.1, p.27.

Verano — Delta II (2012–2017)

2012, 2014, 2016 Factory-verified

2012: GM 2012 ordering guide (4PH69); 2014: GM 2014 fleet guide, Verano page (engine list, model 4PH69)

GM factory document — 2016 buick verano fleet order guide wayback, p.2.
GM factory document — 2012 buick verano online ordering guide copy gm authority, p.1.
GM factory document — 2014 gm fleet car truck guide copy xr793, p.33.
2017 Single-source

2017 rests only on the NICB VIN manual (2017 p.42); no GM list for 2017

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