Models also known as Trim Levels, are used to identify a vehicle's level of equipment or special features.
The Buick Lucerne model we own rides pretty well. The vehicle is smooth and handles bumps pretty decently. It was smoother and handled the bumps better when we first bought it. The model of Lucerne we have has a good sound system. The climate controls do a good job of maintaining a comfortable environment.
We have spent way too much money on repairs, service, parts failure, design flaws, recalls that gm should have stood behind but did not, ridiculous unneeded repairs the mechanics were guessing at. It has been beyond disappointing for a Buick, which is normally a pretty decent vehicle.
The 2009 Buick Lucerne has an average owner rating of 4.15 out of 5 which ranks it #8 of 9 other Large Cars.
From the Vehicle History blog
What's the 2009 buick lucerne oil type?
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Overall
Front
Rollover
Side
Moderate Overlap Front
Side
Roof Strength
Driver-side Overlap Front