3.0 TDI BMK

The C6's big diesel and the engine that makes this car worth buying. It's quick, quiet and long-lived, with rear-mounted timing chains and an oil cooler that both eventually want money.

Overview

The 3.0 TDI is the BMK diesel version of the Audi A6 sedan (C6), sold 2004–2011 with 233 PS and auto_6_tiptronic. Demands diligence at level 3. A durable V6 with rear-mounted chains and an oil cooler that weeps, so the costs are large but predictable and not sudden. 4 failure modes are recorded against its engine, gearbox, chassis and shared components. Prices on this page are illustrative placeholders rather than a sourced market sample. See the methodology for how the bands are derived.

Audi A6 sedan (C6) · photo Audi A6 C6 by IFCAR · Public domain · Wikimedia Commons

Power233 PS

Torque450 Nm

Years2004–2011

Fueldiesel

Drivequattro

EnginesBMK

Biggest risks

Ranked by probability × repair cost. 4 recorded in total.

52Demands diligence

Front-drive cars carry the multitronic CVT€1,800–€4,000partly checkable
Fluid neglect in the tiptronic automatic€350–€2,500partly checkable
DPF clogging and forced regeneration€250–€1,800partly checkable

Risk level −22 · Likely spend vs price −26 · all issues →

System by system9 systems reviewed · 7 with no recurring fault reported

Engine✓ clearNo recurring fault reported for this system on this engine.

Fuel system✓ clearNo recurring fault reported for this system on this engine.

Intake & air✓ clearNo recurring fault reported for this system on this engine.

Cooling✓ clearNo recurring fault reported for this system on this engine.

Emissions⚠ attentionDPF clogging and forced regeneration, €250–€1,800.+1 more in this system

Transmission⚠ attentionFront-drive cars carry the multitronic CVT, €1,800–€4,000.+1 more in this system

Electrics✓ clearNo recurring fault reported for this system on this engine.

Suspension & brakes✓ clearNo recurring fault reported for this system on this engine.

Body & interior✓ clearNo recurring fault reported for this system on this engine.

Pre-facelift or facelift, this engine spans both

The same badge either side of the changeover. Bands are split at the facelift year from the generation record.

Phase	Years	Low	Average	High	Good buy	What differs
pre Pre-facelift	2004–2007	€3,800	€6,200	€10,450	€5,000	The specification the car launched with.
LCI Facelift (LCI)	2008–2011	€4,150	€6,750	€11,400	€5,450	Revised grille, LED daytime running lights and bumpers; Supercharged 3.0 TFSI replaced the 3.2 FSI; Common-rail 2.0 TDI replaced the pump-duse engine; Revised MMI

Known issues, ranked by expected cost

Faults recorded against this engine, its components and its chassis, ranked by likelihood × repair cost. Costs are indicative ranges with a stated labour basis.

Front-drive cars carry the multitronic CVTA6 platform€1,800–€4,000

Shuddering at low speed, hesitation as drive takes up, and eventually slipping or a refusal to move. Most front-drive C6 cars use the multitronic CVT, which is the most expensive gearbox failure in this database. Quattro cars use a conventional tiptronic automatic instead, so which car you're looking at changes the risk completely.

Check: Establish whether it's front-drive or quattro before anything else, then drive it from cold feeling for shudder as it takes up drive, and ask for the fluid service record.

TransmissioncommonPartly detectableevidence: documented120–200k km

Fluid neglect in the tiptronic automaticZF 6HP tiptronic six-speed automatic€350–€2,500

Delayed or harsh shifts, a shudder at light throttle, and slurred changes as the fluid ages. Audi describes the fill as lifetime, and in practice the fluid degrades and the box wears. A service every 80,000 km or so keeps it healthy, and skipping it's what leads to a rebuild.

Check: Ask for a fluid service record, then drive it cold and warm feeling for shift quality. A car with no gearbox history should be priced for a service at minimum.

TransmissioncommonPartly detectableevidence: documented100–200k km

DPF clogging and forced regenerationDPF€250–€1,800

Warning light, limp mode, oil level rising above the maximum mark from fuel dilution. The filter needs sustained hot running to regenerate. A car used for short urban trips never completes a regeneration cycle.

Check: Read the DPF soot load and the distance since the last regeneration on a scan tool, and check the engine oil level and smell it for diesel. Ask what the car was used for. A short-trip city diesel is the wrong car regardless of mileage.

EmissionscommonPartly detectableevidence: documented120–250k km

EGR cooler leakEGR cooler€400–€1,000

Coolant loss with no visible external leak, white smoke, sweet smell. The EGR cooler cracks internally and leaks coolant into the intake. BMW recalled affected diesels over a fire risk from glycol deposits igniting.

Check: Check coolant level and look for unexplained top-ups in the service history. Verify the recall was carried out. It's free and searchable by VIN.

EmissionsoccasionalPartly detectableevidence: manufacturer120–250k km

Ranked by probability × repair cost, not by how loudly a failure is discussed. Inherited from the engine, gearbox, chassis and shared components, each written once.

Pre-purchase inspection

The same issue records, reordered into the sequence you can actually check them in: cold start, static, drive, paperwork.

4 checks · saved in this browser ·

1On the driveInclude low-speed manoeuvring, not just an open road.

Front-drive cars carry the multitronic CVTEstablish whether it's front-drive or quattro before anything else, then drive it from cold feeling for shudder as it takes up drive, and ask for the fluid service record.Fluid neglect in the tiptronic automaticAsk for a fluid service record, then drive it cold and warm feeling for shift quality. A car with no gearbox history should be priced for a service at minimum.

2PaperworkOn these cars the folder is most of the value.

EGR cooler leakCheck coolant level and look for unexplained top-ups in the service history. Verify the recall was carried out. It's free and searchable by VIN.

3OBD scanMandatory. A seller who refuses a scan has answered the question.

DPF clogging and forced regenerationRead the DPF soot load and the distance since the last regeneration on a scan tool, and check the engine oil level and smell it for diesel. Ask what the car was used for. A short-trip city diesel is the wrong car regardless of mileage.

Mileage and servicing

What the odometer does and doesn't tell you here, plus the service items whose neglect causes the expensive failures above.

Mileage matters less than the cold-start sound and the service record. These cover huge distances when they're looked after.

Service item	Interval	Cost
Timing chain Rear chains mean an engine-out repair	listen at every cold start	€2,500–4,000
Oil cooler seals A known age item on this V6	if it weeps	€500–1,000
Automatic fluid The tiptronic is durable but not maintenance-free	80,000 km	€350–550

What to pay

What this engine sells for, against the median of every engine in the chassis. All figures are illustrative placeholders. See the basis chips.

median €6.5k

€3.8k€5k€11.4k

Cheapfind the reasonGood buyif it checks outFairnormal moneyOverpricedneeds justifying

Asking price (€)Mileage (km)

Enter an asking price to get a verdict against this variant's band: cheap, fair, good buy or overpriced.

United States vs Europe

1 EUR = 1.08 USD · 2026-07

🇪🇺 Europe · EUR€5,000band €3,800–€11,400

🇺🇸 United StatesNot sold3.0 TDI BMK was never a US-market car

What that meansNo US band exists to compare. Any car you find there's a private import, parts and specialist knowledge are thinner, and the price says more about import cost than about the market.

US figures are the EU band converted at a stated rate. No US market differential is modelled: we hold no sourced US asking prices, and inventing one would be worse than saying so. What the comparison does show for real is availability. Most of this range was never sold in the US.

ModelAudi A6 3.0 TDI
ChassisC6
EngineBMK
Years2004–2011
MarketCentral EU
Windowrolling 12 months to 2026-07

Good buy at or under the marker · Median asking price · bar spans the 10th to 90th percentile · dashed line is the c6 median, all 5 engines

Good buy isn't the same as cheapest. The good-buy figure assumes the known failure items are either done with receipts or verifiably not yet due. Full breakdown by facelift phase →

Buyer notes

Our judgement, kept separate from the records it's built on.

Our read, not a record

The 3.0 TDI is the reason to buy a C6 at all. It's quick, quiet and effortless, it comes with quattro and the tiptronic automatic rather than the multitronic, and the bottom end lasts. The costs are real, and they're known. Timing chains sit at the back of the engine, and the oil cooler seals weep with age. Neither arrives without warning if you listen at cold start and look for oil in the valley. Then buy the best-documented example you can and it's among the most capable cars in this database.

Everything above this line comes from the issue and specification records. This paragraph is our judgement on top of them. See how we reach it.

Full specification

Manufacturer figures for this engine and body, as recorded in the variant and engine data.

Engine code	BMK/CDYA 3.0 TDI
Configuration	V6, turbocharged · 2967 cc
Fuel / injection	diesel · common rail
Model years	2004–2011
Facelift phase	Sold either side of the 2008 facelift, 2004–2007 pre, 2008–2011 LCI
Power / torque	233 PS · 450 Nm
Transmissions	6-speed tiptronic
Gearbox families	ZF 6HP tiptronic six-speed automatic
Drivetrain	quattro
Economy (real-world)	7–8.5 l/100 km mixed
Markets	EU