Audi/CFSA

Audi · Naturally aspirated

CFSA

RS4·B8·2012–2015

"Given the ridiculous RPM the CFSA can achieve I'm curious how the bearings hold up over time — mine has 45k miles and I plan to have them checked."

RISKY

55/ 100

"Glorious V8, fragile internals demand attention"

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Max HP

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Torque Nm

8,000

Oil interval km

Recalls

Known issues

Known Issues

Bearing Surface Wear at High RPM€3,000-8,000 · 60,000-150,000 kmCRITICAL

The CFSA V8 is known to experience bearing surface wear, particularly concerning given the engine's high-revving nature (reportedly capable of extreme RPM). Forum discussions highlight anxiety around bearing longevity and proactive replacement strategies before failure occurs.

Oil pressure warning light

Knocking or rumbling from engine

Low oil pressure at idle

Metal particles in oil

DIY: Expert only

Oil Pressure Issues and Weak Oil Pump€1,500-4,000 · 50,000-130,000 kmCRITICAL

The CFSA shares architecture with the V6 CALA and V8 CAUA, all known for a weak oil pump and susceptibility to oil pressure loss. Aluminium block with Alusil coating is sensitive to oil starvation. Forum data specifically calls out weak oil pump tendency and coked-up issues.

Oil pressure warning light illuminating

Ticking or clattering on cold start

Engine performance loss

Oil consumption increase

DIY: Expert only

Alusil Cylinder Bore Scoring and Seizure Risk€4,000-12,000 · 80,000-180,000 kmHIGH

The aluminium block uses an Alusil bore coating that is vulnerable to scoring if oil quality degrades or intervals are extended. Once scored, repair is extremely costly. Russian-language forum data directly identifies this as a known issue on V6 CALA and V8 CFSA engines.

Increased oil consumption

Blue smoke from exhaust

Loss of compression

Rough idle

DIY: Expert only

Carbon Build-up and Coking Risk€500-1,500 · 60,000-120,000 kmHIGH

Forum sources note the CFSA family's tendency toward carbon coking, especially if oil change intervals are not kept tight. Carbon deposits on intake valves and within the engine can worsen oil flow and accelerate wear on already sensitive components.

Rough idle

Loss of power

Misfires

Increased fuel consumption

DIY: Moderate

ZF Automatic Transmission Service Neglect€400-1,200 · 60,000-120,000 kmMODERATE

Forum data highlights ZF transmission filters becoming heavily contaminated with metal sludge when service is skipped. The RS4 B8 uses a ZF unit that is frequently neglected by owners who follow the manufacturer's 'lifetime fill' guidance. Neglected units develop shifting issues.

Harsh or hesitant gear changes

Slipping between gears

Delayed engagement

Transmission warning light

DIY: Moderate

Buying Checklist

Request full service history with evidence of sub-8,000 km oil change intervals using correct VW 502/503 spec oil

Conduct a mechanical oil pressure test at idle and 3,000 RPM when fully warmed up — do not rely on the dashboard warning light alone

Commission an oil sample analysis to check for elevated iron, aluminium, and copper particle levels indicating bearing or bore wear

Verify ZF automatic transmission has been serviced with fluid and filter change — inspect current fluid colour and smell for burning

Perform a borescope inspection of the intake ports and valves for heavy carbon deposits indicating neglected maintenance

Check for any oil leaks around the sump, cam covers, and oil pressure sensor, and listen carefully for any ticking or knocking on cold and warm start

Service Reality

Community oil interval8,000 km

Oil specification5W-40 or 0W-40 fully synthetic VW 502.00 / 503.01 compliant (e.g. Castrol Edge, Mobil 1 FS)

Est. ownership cost (2yr)€2,500-6,000 per year including fuel, servicing, and a provision for high-wear components; major engine work can exceed €10,000 if bearings or bores fail

Real mix fuel consumptionNo data

Also Found In

Audi RS5 B8 (CFSA)Audi S5 B8 (CAUA variant)Audi A5 B8 V8 (related architecture)

Buying Advice

The Audi RS4 B8 CFSA is one of the last great naturally aspirated performance saloons, but its 4.2 FSI V8 demands rigorous maintenance discipline that many owners have not provided. The Alusil-lined aluminium block and known oil pump weakness make oil pressure health the single most important check before purchase. Budget generously for immediate bearing inspection, oil pump assessment, and ZF transmission service if history cannot be verified. This engine rewards fastidious owners and punishes neglect with catastrophic repair bills — only buy with full documented service history and post-purchase mechanical inspection from a specialist.