Home EnginesOpel 2.0 CDTI (A20DTH)

Opel (GM) Opel 2.0 CDTI (A20DTH)

Opel 2.0 CDTI (A20DTH) Engine

A workhorse of the GM Europe fleet, this 2.0-liter diesel powered millions of Insignias and Astras. Developed with Fiat (MultiJet base), it is powerful and economical but suffers from one fatal flaw related to its lubrication system.

This overview summarizes the reliability of the Opel (GM) Opel 2.0 CDTI (A20DTH), including common issues and cost drivers.

Modern internal combustion engine — Image credit: Unsplash · Unsplash License

Technical Specifications

Manufacturer

Opel (GM)

Fuel Type

Diesel

Displacement

2.0 L

Production

2008–2015

Power Output

110 hp

Emissions

Euro 5

Reliability Analysis

The engine is mechanically robust (pistons, block, head) but has a severe risk score of 6.5/10 purely due to the oil seal issue. If the seal is replaced preventively, the engine is capable of 400,000+ km. If ignored, it is a ticking time bomb.

Caution

Autoscore Verdict

Caution. A great budget diesel IF (and only if) the oil pickup seal has been replaced recently. Otherwise, walk away or budget €500 immediately for the fix.

Risk Score

6.5

out of 10

Common Problems & Weak Points

Issue	Typical Mileage	Repair Cost (Est.)	Severity
Oil Pump Seal Failure	~150,000 km	€400 – €5000	High

Oil Pump Seal Failure

This is the most critical issue for the A20DTH. A small rubber O-ring seal on the oil suction pipe hardens over time. This causes the oil pump to suck air instead of oil, leading to 'Low Oil Pressure' warnings on cold starts and eventually sudden engine seizure due to bearing failure. It is preventable by replacing the seal every 4-5 years.

Typical Mileage: 150,000 km

Cost: €400–5000

Buyer's Inspection Checklist

Check for 'Low Oil Pressure' warning on cold start (even if it disappears quickly).
Ask for proof of oil pickup seal replacement.
Listen for knocking sounds from the bottom end (bearing damage).
Check for dual-mass flywheel rattle.

Frequently Asked Questions

Is the Opel 2.0 CDTI (A20DTH) engine reliable?

The Opel 2.0 CDTI (A20DTH) has known weak points, but with good maintenance the reliability is solid. See the risk analysis and common problems for specifics. Start a report for a specific car.

How expensive are typical repairs?

Common repairs fall into a mid-range cost band depending on the issue and workshop. Check the cost ranges in the table. Use the used car report for specific listings.

Which model years are best for this engine?

Newer production years often include technical updates. Review the production years and revisions in the specs. Use Car Check for quick screening.

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