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Audi BCY
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Audi BCY
Verdict
RISKY · 48/100
Est. cost /3yr
€9,000-15,000 over 3 years depending on coolant pipe and turbo condition at purchase
Oil interval
10,000 km
Recalls
0
Worst issue
Plastic Coolant Pipe Failure
CRITICAL
Audi BCY
C5 · C5 RS6
Plastic Coolant Pipe Failure
€1,200-2,500
CRITICAL
K04 Turbocharger Wear and Failure
€2,500-5,500
HIGH
Wastegate Rattle
€200-600 per side
MODERATE
Secondary Air Injection Pump Failure
€300-800
MODERATE
PCV / Oil Separator Wear
€150-500
MODERATE
Audi BCY
C5 · C5 RS6
•Ask specifically whether the plastic coolant pipes have been replaced with the aluminium aftermarket kit, this is the single biggest cost item on the car
•Have a specialist inspect both turbochargers for shaft play and check for oil coking in the feed lines
•Cold start the car and listen for wastegate rattle on both banks
•Scan for secondary air injection fault codes
•Check for oil seepage around valve covers and the crankcase breather housing
•Review full service history, this engine punishes neglected oil changes more than most
•Budget €2,000-3,000 as an immediate contingency fund even on a car with clean history
•Inspect the subframe and surrounding area for damage from previous coolant pipe repair work
Audi BCY
C5 · C5 RS6
Plastic coolant pipes (factory)
Replace proactively with aftermarket aluminium pipe kit if not already done, regardless of documented history
80,000-100,000 km
K04 turbochargers (pair)
Boost test and inspect for shaft play before purchase, budget for replacement of both if either shows wear
120,000-160,000 km
Oil feed and drain lines to turbos
Inspect for carbon coking, replace if oil changes have been infrequent
100,000 km
Secondary air injection pump
Check for fault codes and pump operation on cold start
100,000-140,000 km
Audi BCY
C5 · C5 RS6
No recalls on record
Audi BCY
C5 · C5 RS6
✓Based on the naturally aspirated 4.2 V8 block shared with the S6/A8, a fundamentally robust bottom end
✓Timing chain driven, not belt, so no fixed belt replacement interval
✓Quattro all-wheel drive gives excellent traction and stability for the power output
✓450 PS output has aged well and remains genuinely quick by modern standards
✓Strong aftermarket support for coolant pipe and turbo upgrades due to the car's cult following
Audi BCY
C5 · C5 RS6
Real consumption
14 L/100km
Official consumption
Not available
Oil interval
10,000 km
Oil spec
5W-40 fully synthetic, VW 502.00 specification
Est. cost /3yr
€9,000-15,000 over 3 years depending on coolant pipe and turbo condition at purchase