2.0 MZR-CD (diesel)
2007–2010 · diesel · 1998cc · 140hp
Engine codes: RF
Reliability, common problems and owner reviews for the Mazda Mazda 6 2.0 MZR-CD (diesel). Check this before you buy used.
The 2.0 diesel suffers from fuel getting into the oil (oil dilution) and DPF trouble — the oil level must be watched and the ECU oil-dilution reset done at every oil change. Neglect leads to expensive DPF and lubrication problems. Workable only with disciplined maintenance and motorway use.
Known Issues
Fuel enters the oil system, raising the level and degrading lubrication; the ECU oil-dilution reset MUST be done at every oil change.
Fix / Workaround: Do the oil-dilution reset at every service; watch oil level; regular motorway runs.
Repair cost: €0–€2000
Typically appears after: 80,000 km
DPF clogs; faulty DPF temperature sensors cause high idle/fuel use.
Fix / Workaround: Motorway runs; clean DPF; replace temp sensor.
Repair cost: €200–€1200
Mileage Thresholds
After 100,000 km: Oil-dilution/DPF issues cluster.
Pre-Purchase Checklist
- ☐Confirm oil-dilution resets were done at every oil change
- ☐Check oil level/smell
- ☐Buy only if motorway-used
- ☐DPF history
Frequently asked questions
Is the Mazda Mazda 6 2.0 MZR-CD (diesel) reliable?
Problematic — The 2.0 diesel suffers from fuel getting into the oil (oil dilution) and DPF trouble — the oil level must be watched and the ECU oil-dilution reset done at every oil change. Neglect leads to expensive DPF and lubrication problems. Workable only with disciplined maintenance and motorway use.
What are the common problems and reviews for the Mazda Mazda 6 2.0 MZR-CD (diesel)?
The most commonly reported problems: Oil dilution (fuel in oil), DPF clogging / temp sensor.
Is a used Mazda Mazda 6 2.0 MZR-CD (diesel) worth buying?
Known design issues and recurring faults that were never fully resolved. Buy only with eyes open.