Germany's people's car brand since Adam Opel started building them in Rüsselsheim in 1899. Decades under GM, now Stellantis — every ownership era left its mark on the engine lineup. The best Opels are genuinely cheap to run; the worst hide timing chain grenades under the bonnet.
| Engine | Found in | Verdict | Rating |
|---|---|---|---|
| Z17DTH (1.7 CDTI) | Astra H, Astra J, Corsa D, Meriva, Zafira B (2004-2014) | Isuzu-designed diesel with belt drive instead of chain. Some owners report 500,000+ km. EGR and turbo need attention at high mileage, but fundamentally robust. | Reliable |
| A14XER (1.4 NA) | Astra J, Corsa E, Mokka (2009-2019) | Simple naturally aspirated petrol with no turbo or timing chain concerns. Low power but very reliable. | Reliable |
| Z18XER (1.8) | Astra H, Insignia A, Zafira B (2005-2013) | Durable 1.8 petrol. Ignition module is a consumable item around 70,000 km. Valve cover gasket and PCV system need periodic attention. Overall long-lasting. | Reliable |
| B16DTH (1.6 CDTI) | Astra K, Insignia B, Zafira C, Mokka (2014-2020) | Timing chain tensioner design flaw lets oil drain overnight, causing chain rattle and premature wear. Uprated tensioner with gasket fixes it permanently. Check before buying. | Caution |
| Z19DTH (1.9 CDTI) | Astra H, Vectra C, Zafira B, Signum (2004-2010) | Strong 150 PS diesel. Intake manifold swirl flaps wear and can break off into the engine. Dual-mass flywheel and EGR are regular maintenance items. | Caution |
| A20DTH (2.0 CDTI) | Astra J, Insignia A, Zafira C (2008-2017) | Oil pickup seal hardens over time, causing oil starvation on cold starts. Turbo bearings wear between 100,000-150,000 km. Solid engine if you address the seal proactively. | Caution |
| Z13DTH (1.3 CDTI) | Corsa D, Corsa E, Meriva, Combo (2006-2019) | Fiat Multijet-derived diesel. Timing chain can stretch at relatively low mileage if oil changes are neglected. Opel's 50,000 km oil change interval is too long — halve it. | Caution |
| 1.2 PureTech (EB2) | Corsa F, Crossland, Grandland (2019+) | PSA three-cylinder with known oil-bath timing belt failures before 2023. Piston ring carbon buildup causes oil consumption. Post-2023 chain-driven versions are improved. | Caution |
| A14NET (1.4 Turbo) | Astra J, Mokka, Cascada, Meriva B (2010-2018) | Crankcase ventilation system fails on virtually all examples. Turbo actuator spring weakens. Low-speed pre-ignition can crack pistons. High maintenance costs for a small engine. | Avoid |
| DV5 (1.5 Diesel) | Astra L, Corsa F, Grandland, Mokka Mk2 (2019+) | PSA diesel with undersized 7mm timing chain prone to premature stretch and breakage. Stellantis extended warranty to 10 years. Post-2023 cars use stronger 8mm chain. | Avoid |
Opel's most persistent problem spans three different engine families. The B16DTH 1.6 CDTI has a flawed timing chain tensioner that drains oil overnight, the DV5 1.5 diesel inherited PSA's undersized 7mm chain, and the small petrol 1.2/1.0 engines stretch their chains after 100,000 km. A cold-start rattle lasting 1-2 seconds is the warning sign across all affected engines.
Turbo failures affect both petrol and diesel Opels, but through different mechanisms. The A14NET 1.4 Turbo suffers from actuator spring weakness causing reduced boost. The 2.0 CDTI diesel turbos wear bearings between 100,000-150,000 km, often triggered by oil starvation from the hardened pickup seal. Replacement costs €1,000-2,000.
Every diesel Opel suffers from EGR valve fouling to some degree, but the 1.9 CDTI Z19DTH is especially vulnerable because its intake manifold swirl flaps wear out and can physically break off, falling into the engine. Regular cleaning helps, but many owners delete the swirl flaps entirely as a preventive measure.
Small diesel Opels used primarily in city traffic rarely reach the exhaust temperatures needed for DPF regeneration. The Corsa with the 1.3 CDTI is the worst offender — it's too light and too efficient to get the DPF hot enough during short trips. A clogged DPF triggers limp mode and costs €800-1,500 to replace. If your commute is under 15 km, buy petrol.
The torquier diesel engines — particularly the 1.9 and 2.0 CDTI units — are hard on dual-mass flywheels, with rumbling at idle and clutch judder being early warning signs. Budget €800-1,200 for flywheel and clutch replacement together. Manual gearboxes can also develop a whining noise from worn bearings, especially in the M32 six-speed fitted to many Astra and Insignia variants.
Cost estimates based on 15,000 km/year in Western Europe. Individual costs may vary based on driving style, location, and maintenance history.