Audi A4

The AWA 1.8T EA113 tends to severe oil sludge formation (sludge) with irregular oil changes, blocking oil passages and leading to oil-starved camshaft bearing lubrication. Engine damage likely.

Symptoms: Oil pressure warning light, chain rattle on cold start, ticking, in the worst case engine damage from camshaft failure

The EA113 1.8T uses a timing belt with a recommended 90,000 km change interval. The water pump has a plastic impeller that can break when worn. Replacement together is mandatory.

Symptoms: Coolant loss, overheating on water pump failure; engine damage on timing belt failure

With long oil change intervals, solid sludge deposits form throughout the lubrication circuit. Blocks the oil pump strainer and leads to oil pressure drop and engine damage.

Symptoms: Sporadic oil pressure warning light, metallic clicking, oil pressure loss

The EA113 1.8T ignition coils are a known wear item and frequently fail, often all four in quick succession. Complete replacement of all coils when one fails makes sense.

Symptoms: Rough running, misfires, engine warning light, power loss, noticeable judder at idle

The multi-link front axle is prone to control arm wear. Rubber bushings and bushes become brittle. The upper mounting bolt corrodes and frequently snaps on removal.

Thermostat fails frequently. If it sticks open, the engine stays cold (cold heating, high fuel consumption); if it sticks closed, overheating is imminent. Replace the water pump at the same time.

Tie rod ends and steering bearings wear early due to the heavy front end. Ageing rubber parts crack, creating steering play. Frequent TÜV failure point.

The AC compressor fails at higher mileages, often caused by lack of AC servicing. Total cost for compressor replacement is €700–1,300.

Water enters the passenger compartment through blocked AC condensate drains or faulty seals in the water drain tray. Consequential damage to electronics and carpets possible.