Engine reliability isn't opinion.
It's data.
Before you buy a used car, check the engine first.
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Most Reliable Engines
The engines that just refuse to die. Top reliability scores across all brands.
Engines to Avoid
These engines have known, expensive failure modes. Walk away — or negotiate hard.
Best Diesel Engines
Reliable diesels that won't kill your wallet with DPF and turbo problems.
Best Petrol Engines
Naturally aspirated and turbo petrol engines you can trust.
Best BMW Engines
Which BMW engines to buy — and which to run from.
Best Mercedes-Benz Engines
Mercedes reliability decoded — from bulletproof to money pit.
Best Audi Engines
Audi and VW Group engines ranked. EA888 Gen 1 vs Gen 3 — night and day.
Best Toyota Engines
Toyota's legendary reliability — verified. Zero AVOID verdicts.
Best Volkswagen Engines
VW engines from the legendary 1.9 TDI to the modern EA211.
Buying Guides
Model-by-model breakdowns. Which engine to get, which year to avoid.
Know exactly what you're buying
Enter any VIN — we decode the engine for free, cross-reference our reliability database, and tell you what to watch out for.
From the EngineScope Blog
Explore the Data
Scatter plots, brand comparisons, reliability by displacement, fuel type, and HP range. The full EngineScope dataset, visualised.
Open Analytics →How we score engines
No opinions. No brand loyalty. Just data.
Real issue data
Every known issue sourced from technical service bulletins, owner forums, and workshop reports.
Weighted scoring
Severity, repair cost, mileage onset, and frequency combine into a single 0–100 score.
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We don't take money from manufacturers or dealers. Scores cannot be bought.