Which is more reliable, Buick or GMC?
Nearly a tie: Buick averages 58/100 vs GMC at 56/100 across 109 real pre-purchase inspections (38 Buick / 71 GMC). 52% of Buicks and 48% of GMCs scored 60/100 or higher.
Nearly a tie: Buick averages 58/100 vs GMC at 56/100 across 109 real pre-purchase inspections (38 Buick / 71 GMC). 52% of Buicks and 48% of GMCs scored 60/100 or higher. The average car we check scores 61/100.
Head to head
| Buick | GMC | |
|---|---|---|
| Cars inspected | 38 | 71 |
| Average condition | 58/100 | 56/100 |
| In good shape (60+/100) | 52% | 48% |
| Repainted or replaced panel | 71% | 75% |
| Structural repair found | 0% | 4% |
| Fault codes recently cleared | 24% | 30% |
Green = the better number of the pair. Condition reflects the mix of cars that came to us — age, price, model — so treat small gaps as a tie.
How they score
How long do they stay good?
Good cars by mileage
▬ Buick▬ GMC▬ all cars
Good cars by age
▬ Buick▬ GMC▬ all cars
Share in good shape (scoring 60+/100) by mileage and by age when we inspected them (each dot ≥5 cars; a band under 20 cars follows the nearby bands, so a run above the all-cars line stays above it, and a band of 20 or more uses the rate we measured; where a band has too few cars, the line follows the trend between the bands on either side; rolled-back odometers excluded from the mileage curve). Dashed grey = all cars we check.
Most common faults
Oil leaks · Engine
61%
Tires condition & wear · Brakes and tires
45%
Fuel trim out of range · Engine
37%
Active error codes · Electronic equipment
34%
Oil leaks · Automatic transmission
24%
Oil leaks · Engine
48%
Active error codes · Electronic equipment
44%
Tires condition & wear · Brakes and tires
39%
Fuel trim out of range · Engine
39%
Leaking or worn shock absorbers · Suspension
25%
FAQ
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What are the most common problems with used Buicks and GMCs?
On Buicks we flag oil leaks (61%), tires condition & wear (45%), fuel trim out of range (37%). On GMCs: oil leaks (48%), active error codes (44%), tires condition & wear (39%).
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How many Buick and GMC vehicles have you inspected?
38 Buicks and 71 GMCs — 109 real pre-purchase inspections. Updated Oct 27, 2026.
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Should I still get a pre-purchase inspection?
Yes. Badge averages don't sort the good car from the tired one. We still find repainted panels on 71% of Buicks and 75% of GMCs, and recently cleared fault codes on 24% / 30%.
Buying a used Buick or GMC? Get a pre-purchase inspection before you pay.
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Based on 109 inspections · updated Oct 27, 2026
