Buick Flex Fuel Vehicles

Factory FFV models

Still producing FFVs in 2026

One of only three brands still selling new flex-fuel vehicles

Buick is the quiet member of the GM flex-fuel trio that still ships new FFVs today. The brand entered the flex-fuel market in 2007 with the Terraza minivan (a sibling of the Chevy Uplander), expanded in 2009 with the Lucerne 3.9L V6 full-size sedan, and carried the LaCrosse 3.6L LFX V6 as a factory FFV from 2012 through 2016. The Regal 2.0L turbo and 2.4L and the Verano 2.4L also offered flex-fuel capability during a brief window from 2011–2013.

Buick's FFV production paused after 2016 and then resumed with the new Envista 1.2L turbo three-cylinder for model year 2024 — making Buick the third brand, alongside Chevy and GMC, with current flex-fuel offerings. Notably, the Buick Enclave three-row crossover is not flex-fuel, despite common assumption; its owner's manual caps ethanol content at E15. The Rainier and Rendezvous SUVs were never factory FFVs either. Buick's installed base of flex-fuel vehicles is modest but dependable, and the Envista gives current shoppers a genuinely new-car option.

Buick flex fuel models

Model	Year range	Engine	Notes
Terraza	2006–2007	3.9L V6	Minivan; GM U-body sibling
Lucerne	2009–2011	3.9L V6	VIN "M" engine only
LaCrosse	2012–2016	3.6L LFX V6	2010–2011 LaCrosse was NOT FFV
Regal	2011–2013	2.0L turbo; 2.4L I4
Verano	2012–2013	2.4L I4
Envista	2024–present	1.2L turbo I3	Currently in production

Buick-specific E85 tips

Lucerne FFV is VIN-specific.

Only the 3.9L V6 version is flex-fuel; the 3.8L V6 and 4.6L Northstar V8 Lucernes are not. The VIN 8th-character "M" confirms the FFV 3.9L.

LaCrosse FFV did not begin until 2012.

The 2010 and 2011 LaCrosse 3.6L V6 recommend premium fuel and are not flex-fuel. Buyers shopping a used LaCrosse should focus on 2012–2016 for E85 capability.

Enclave is not an FFV.

This is worth saying clearly: Buick's three-row crossover explicitly caps ethanol at E15, and dealer listings that advertise Enclave as "flex fuel" are incorrect. If you want a Buick three-row that runs E85, the brand does not offer one.

The Envista is the easiest new FFV purchase.

For 2025 and 2026 shoppers, Envista offers a new-car FFV in compact-crossover form at a price point well below truck territory. Its 1.2L three-cylinder is shared with Chevy Trailblazer and Trax, and fuel-economy expectations scale similarly on E85.