The 2007 Buick Lucerne generally uses Dexron VI automatic transmission fluid (ATF).
For context, the Lucerne employs a GM four-speed automatic transmission (commonly the 4T65-E family). GM's guidance for these mid-2000s automatics is to use Dexron VI ATF, which is backward-compatible with older Dexron formulations and provides improved wear protection and shift quality. However, always verify the exact specification for your vehicle by checking the owner's manual or consulting a GM dealer, since engine/transmission configurations and production dates can vary by VIN.
Official guidance and compatibility
GM's documentation for mid-2000s GM automatics, including the Lucerne's, identifies Dexron VI as the recommended ATF. Dexron VI is backward-compatible with older Dexron (e.g., Dexron III) fluids, but mixing generations is not recommended during a transfer or full-fluid change without professional guidance.
Dexron VI: GM's current recommendation
The transmission in most 2007 Lucerne models is designed to use Dexron VI Automatic Transmission Fluid. Using Dexron VI helps ensure proper shifting performance and long-term protection of internal components.
GM explains the preferred fluid type for this era of automatics, and Dexron VI is the standard you should use when servicing the Lucerne’s transmission.
Bottom line: Dexron VI ATF is the official recommendation for the Lucerne’s automatic transmission, with Dexron VI being backward-compatible with older Dexron formulations.
How to verify for your vehicle
To confirm the exact ATF specification for your specific Lucerne, follow these steps:
- Check the owner’s manual or the GM service information for the exact ATF specification listed for your model year and engine/transmission combination.
- Identify your transmission model (likely a 4T65-E family unit) via the vehicle VIN or service documents to ensure the correct fluid is used.
- If in doubt, contact a Buick/GMC dealer or qualified technician with your VIN to confirm Dexron VI is appropriate for your car’s particular configuration.
- When performing a fluid change, use Dexron VI ATF and avoid mixing in non-Dexron fluids unless specifically directed by a professional.
Concluding note: Always verify the exact specification for your vehicle, but Dexron VI is the standard recommendation for most 2007 Lucerne transmissions.
Summary
For a 2007 Buick Lucerne, the recommended transmission fluid is Dexron VI Automatic Transmission Fluid. This guidance comes from GM’s documentation for mid-2000s GM automatics. Verify the exact specification for your VIN in the owner's manual or with a dealer, as configurations can vary. When in doubt, use Dexron VI and consult a professional for a precise diagnosis or service.