3.0 TFSI supercharged 300hp (CGWB / CGWD)
2011–2014 · petrol · 2995cc · 300hp
Engine codes: CGWB, CGWD
Reliability, common problems and owner reviews for the Audi A6 C7 3.0 TFSI supercharged 300hp (CGWB / CGWD). Check this before you buy used.
The supercharged 3.0 TFSI V6 at 300 hp in the A6 C7. Strong and smooth; the bills come from plastic coolant parts — the thermostat housing and water pump housing crack or weep — and the thermostat sits under the supercharger, so it comes off for the job. A failed supercharger isolator rattles like marbles and, if ignored, can damage the supercharger. Early 2012–2013 cars also show chain-tensioner reports.
Known Issues
Plastic housings crack or warp; the pump weeps from its bearing weep hole. The supercharger has to come off to reach the thermostat.
Fix / Workaround: Check coolant level and the V of the engine for residue; do pump and thermostat together.
Worn isolator gives a marbles-type rattle at idle; left alone it can damage the supercharger internals.
Fix / Workaround: Replace the isolator early.
Tensioner failures are reported on 2012–2013 cars.
Fix / Workaround: Cold-start rattle check.
Pre-Purchase Checklist
- ☐Rattle at idle (isolator)
- ☐Coolant residue in the engine V
- ☐Cold-start chain rattle
Frequently asked questions
Is the Audi A6 C7 3.0 TFSI supercharged 300hp (CGWB / CGWD) reliable?
Maint. Sensitive — The supercharged 3.0 TFSI V6 at 300 hp in the A6 C7. Strong and smooth; the bills come from plastic coolant parts — the thermostat housing and water pump housing crack or weep — and the thermostat sits under the supercharger, so it comes off for the job. A failed supercharger isolator rattles like marbles and, if ignored, can damage the supercharger. Early 2012–2013 cars also show chain-tensioner reports.
What are the common problems and reviews for the Audi A6 C7 3.0 TFSI supercharged 300hp (CGWB / CGWD)?
The most commonly reported problems: Water pump and thermostat housing leaks, Supercharger isolator, Timing chain tensioner (early cars).
Is a used Audi A6 C7 3.0 TFSI supercharged 300hp (CGWB / CGWD) worth buying?
Fine if serviced correctly — but it punishes neglect hard. History and the right consumables matter.