1982 AUDI 4000

Typical onset: 120,000-180,000 mi

Symptoms: Heavy blue smoke on startup and acceleration, Severe oil consumption (quart per 500 miles or worse), Knocking or rattling from bottom end, Loss of compression across multiple cylinders

Fix: These Audi four-cylinders are notorious for ring land failure and main bearing wear if oil changes were skipped. Repair requires full engine rebuild or short block replacement—expect 18-24 hours labor for R&R plus machine work. Many owners opt for used engine swaps instead.

Estimated cost: $2,800-5,500

Typical onset: 60,000-100,000 mi

Symptoms: Severe clunking when shifting from reverse to drive, Vibration through shifter and floor at idle, Visible engine movement when revving in park, Shifter feels notchy or misaligned

Fix: Front-mount and side mounts deteriorate predictably—rubber separates from metal brackets. Replacement requires supporting the drivetrain from below; front mount is 2-3 hours, side mount adds another 1.5 hours. OE-quality parts are scarce.

Estimated cost: $350-650

Symptoms: Hard starting when hot or after sitting, Rough idle and hesitation under load, Stalling at stops after highway driving, Fuel smell from engine bay

Fix: 40-year-old fuel lines crack and corrode, inline filter clogs with rust from tank. CIS fuel injection is sensitive to restriction. Budget for fuel filter every year (0.5 hours), but if lines are weeping, plan on replacing hardlines and rubber sections—4-6 hours for thorough job.

Estimated cost: $45-85 (filter only), $600-1,200 (lines included)

Symptoms: Won't start despite good fuel pressure, Runs on some cylinders but not others, Black smoke and flooding, Fuel dripping from injectors when off

Fix: The Bosch K-Jetronic fuel distributor has internal diaphragms and seals that fail over time. Rebuild kits exist but require precision—most techs swap in a used or rebuilt unit. 3-4 hours labor plus expensive part.

Estimated cost: $800-1,500

Typical onset: 80,000-140,000 mi

Symptoms: Overheating in traffic or on hills, Coolant weeping from hose connections, Heater blows cold intermittently, Expansion tank cracked or stained brown

Fix: All original rubber hoses and plastic components are brittle by now. Radiator end tanks crack, water pump bearings fail, thermostat sticks. Smart move is full cooling refresh—all hoses, expansion tank, radiator, thermostat, water pump—about 5-7 hours labor total.

Estimated cost: $700-1,400

Typical onset: 70,000-120,000 mi

Symptoms: ATF dripping near radiator or under car, Low transmission fluid without visible leak from pan, Transmission slipping or delayed engagement after leak progresses

Fix: Automatic models have cooler lines running to radiator that corrode and weep. If ignored, transmission starves for fluid. Replace both lines and top off fluid—2 hours labor.

Estimated cost: $250-450

Symptoms: Gauges that read erratically or not at all, Intermittent no-start (starter clicks), Dim lights at idle, Random warning lights

Fix: German cars of this era had minimal corrosion protection on ground straps. Main grounds at battery, transmission bell housing, and fender-mounted points all corrode. Cleaning and re-terminating grounds is 1-2 hours but solves bizarre issues.

Estimated cost: $80-200