2013 AUDI A5

Typical onset: 60,000-100,000 mi

Symptoms: Burning 1+ quart of oil every 1,000 miles, Blue smoke from exhaust on cold starts or acceleration, Carbon buildup on intake valves causing rough idle and misfires, Eventually leads to scored cylinders and complete engine failure if run low on oil

Fix: Audi extended warranty covered this until 2015 but most are expired now. Proper fix requires engine-out teardown, new pistons and rings (updated design), valve cleaning, and honing cylinders. 20-30 labor hours depending on ancillary damage. Many owners run catch cans and just top off oil religiously until catastrophic failure, then opt for used/reman long block.

Estimated cost: $6,000-12,000

Typical onset: 70,000-120,000 mi

Symptoms: Pink or red fluid dripping under vehicle near front of engine, Transmission fluid level drops, causes delayed shifts or slipping, Coolant mixing with trans fluid creates milky appearance in reservoir

Fix: The cooler is integrated into the radiator end tank and develops cracks. Requires replacement of entire radiator assembly plus fresh ATF and filter. Some techs flush system multiple times if coolant contaminated the trans. 4-6 labor hours.

Estimated cost: $1,200-2,000

Typical onset: 40,000-80,000 mi

Symptoms: Check engine light with misfire codes P0300-P0304, Rough idle and hesitation under load, Poor fuel economy and lack of power

Fix: Direct injection engines run coils hard. OEM coils are expensive but aftermarket options fail quickly. Best practice: replace all four coils and plugs together. 1.5 labor hours.

Estimated cost: $600-900

Typical onset: 50,000-90,000 mi

Symptoms: Rough idle, especially when cold, Hesitation or stumbling during acceleration, Reduced fuel economy and power, Misfires that move between cylinders

Fix: Direct injection = no fuel washing valves. Requires walnut blasting the intake ports with manifold removed. Should be done preventively every 60k-80k miles. 4-5 labor hours.

Estimated cost: $600-1,000

Typical onset: 60,000-100,000 mi

Symptoms: Rough idle and whistling noise from engine bay, Increased oil consumption (contributes to ring issues), Check engine light with boost leak or misfire codes, Oil in intake tract or intercooler

Fix: The PCV system is integrated into the valve cover on this engine. Some techs replace just the valve, but proper fix is entire valve cover assembly. Exacerbates the oil consumption problem if ignored. 2-3 labor hours.

Estimated cost: $400-800

Typical onset: 70,000-110,000 mi

Symptoms: Coolant weeping from front of engine, Coolant level drops slowly over time, Overheating if leak becomes severe, Sweet smell from engine bay

Fix: Electric water pump and plastic thermostat housing both fail. Smart to replace both together with updated parts while you're in there. Timing belt should be inspected if not recently done. 4-5 labor hours.

Estimated cost: $1,000-1,600

Symptoms: Water pooling in footwells after rain or car wash, Wet carpet on driver or passenger side, Musty smell in cabin, Water stains on headliner near A-pillars

Fix: Drain tubes run down A-pillars and clog with debris. Requires blowing them out with compressed air or flexible wire. Check all four drains (two front, two rear). Sometimes tubes separate at joints requiring interior trim removal. 1-2 labor hours for cleaning, more if tubes need reattachment.

Estimated cost: $150-400