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We cover the Regal from 2000 to 2020. Early cars use the 3.8-liter V6, with a supercharged version in the GS. The 2011 to 2017 Regal uses 2.4-liter and 2.0-liter turbo engines. The 2018 to 2020 Regal Sportback and TourX use a 2.0 turbo with an 8- or 9-speed automatic and available AWD.


Your 2004 Buick Regal is from the fourth-generation Regal, which covers model years 1997–2004. It is the last model year of this generation and includes the running changes made during production, which is why a manual for the exact year matters.
Check the model year on your VIN: on a 2004 vehicle the 10th character of the 17-digit VIN is “4”. Vehicles built for North America always carry the model year in that position; on some European or Australian vehicles it may be left unused, so in that case go by the registration papers or the build plate.
At about 22 years old, a 2004 vehicle is in the age range where wiring, rubber hoses, seals and corrosion repairs take most of the work, and where original factory information is hardest to find.
Same generation: 2000 Buick Regal, 2001 Buick Regal, 2002 Buick Regal, 2003 Buick Regal.
All Buick Regal model years: 2000 · 2001 · 2002 · 2003 · 2004 · 2011 · 2012 · 2013 · 2014 · 2015 · 2016 · 2017 · 2018 · 2019 · 2020
Engine
3.8L (L36 L67)
Transmission
Automatic Transaxle - 4T65-E
