Which is more reliable, Mercedes or Porsche?
In our inspections, Mercedes’ average condition stays above the “decent” threshold to around 92k miles, about the same as Porsche at 98k.
In our inspections, Mercedes’ average condition stays above the “decent” threshold to around 92k miles, about the same as Porsche at 98k.
Based on 278 Mercedes vehicles and 130 Porsche vehicles. “Decent” means a condition score of 55/100.
Head to head
| Mercedes | Porsche | |
|---|---|---|
| Cars inspected | 278 | 130 |
| Average condition | 62/100 | 69/100 |
| In good shape (60+/100) | 56% | 71% |
| Holds up to (avg dips below decent) | ~92k mi | ~98k mi |
| Repainted or replaced panel | 77% | 77% |
| Structural repair found | 1% | 4% |
| Fault codes recently cleared | 20% | 20% |
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
▬ Mercedes▬ Porsche▬ all cars
Good cars by age
▬ Mercedes▬ Porsche▬ 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
64%
Active error codes · Electronic equipment
49%
Tires condition & wear · Brakes and tires
39%
Fuel trim out of range · Engine
36%
Electronic components issues · Engine
19%
Oil leaks · Engine
50%
Tires condition & wear · Brakes and tires
35%
Low coolant / cooling system issues · Engine
30%
Worn brake rotors · Brakes and tires
27%
Active error codes · Electronic equipment
24%
Trajectory by generation
Mercedes
▲ Newer Mercedes vehicles are holding up better
Porsche
Not enough Porsches at the 5–10 year checkpoint yet to draw a generation trend.
Share in good shape when inspected at the same age (5–10 years, age-adjusted), by model-year generation; dashed = all-brand average. All brands →
FAQ
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What are the most common problems with used Mercedes vehicles and Porsche vehicles?
On Mercedes vehicles we flag oil leaks (64%), active error codes (49%), tires condition & wear (39%). On Porsche vehicles: oil leaks (50%), tires condition & wear (35%), low coolant / cooling system issues (30%).
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How many Mercedes and Porsche vehicles have you inspected?
278 Mercedes vehicles and 130 Porsche vehicles — 408 real pre-purchase inspections. Updated Nov 11, 2026.
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How long do Mercedes and Porsche stay in decent condition?
In our data, decent is a 55/100 score. The average Mercedes dips below it around 92k mi; Porsche around 98k mi. Individual cars vary — get the one you’re buying inspected.
Buying a used Mercedes or Porsche? Get a pre-purchase inspection before you pay.
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Based on 408 inspections · updated Nov 11, 2026
