2000 MERCEDES-BENZ SLK230 KOMPRESSOR R170

Typical onset: 80,000-140,000 mi

Symptoms: excessive oil consumption (1+ quart per 1000 miles), blue smoke on startup or acceleration, knocking/rattling from bottom end, loss of compression, metal shavings in oil

Fix: Complete engine rebuild or short block replacement required. Includes pistons, rings, bearings (main and rod), machining work, head gasket replacement. 25-35 labor hours for proper rebuild with machine shop time. Many owners opt for used engine swap instead (15-20 hours) but risk inheriting same problems.

Estimated cost: $4,500-8,000

Typical onset: 70,000-120,000 mi

Symptoms: transmission fluid leaking from front of engine bay, overheating transmission (harsh shifts when hot), pink/red fluid pooling under car, transmission slipping after highway runs

Fix: Replace external transmission oil cooler and all connecting lines. Often corroded where lines attach. Must flush transmission after repair to remove debris. 3-4 labor hours plus fluid service.

Estimated cost: $600-1,200

Typical onset: 60,000-100,000 mi

Symptoms: clunking when shifting from Park to Drive/Reverse, excessive vibration at idle in gear, visible transmission sag when inspected from below, harsh engagement into gear

Fix: Replace transmission mount (large rubber/hydraulic mount on passenger side). Requires transmission support while removing mount. 2-3 labor hours. Often done with engine mounts simultaneously as they fail on similar schedule.

Estimated cost: $400-700

Typical onset: 90,000-150,000 mi

Symptoms: chirping or squealing from front of engine that varies with RPM, loss of boost pressure/power, smell of burning rubber, supercharger not engaging (no whine under acceleration)

Fix: Supercharger removal and clutch/bearing replacement. Supercharger must be sent out or rebuilt in-house. Includes serpentine belt replacement. 8-12 labor hours total with removal/reinstall/alignment.

Estimated cost: $1,800-3,000

Symptoms: top stalls mid-cycle and won't complete open/close, hydraulic fluid leaking into trunk area, slow operation (more than 30 seconds), one side moves faster than other, top control module error messages

Fix: Typically hydraulic cylinders, pump, or lines leaking/failing. Sometimes control module corrosion from water intrusion through drains. Diagnosis is 1-2 hours, repair varies widely. Cylinder replacement 4-6 hours, pump 3-4 hours, module 2 hours.

Estimated cost: $800-2,500

Typical onset: 80,000-130,000 mi

Symptoms: no-start condition (cranks but won't fire), random stalling while driving, intermittent starting issues when engine is hot, check engine light with crank sensor code

Fix: Replace crankshaft position sensor located at bellhousing. Access is terrible - often requires removal of starter and sometimes transmission mount/support. 2-3 labor hours for sensor access alone.

Estimated cost: $350-600

Typical onset: 100,000-160,000 mi

Symptoms: white smoke from exhaust, coolant loss with no external leaks, overheating, oil/coolant mixing (milky oil or oil in coolant), rough idle/misfires

Fix: Head gasket replacement requires cylinder head removal, resurfacing, new bolts, timing chain components. Often discovered during diagnosis of oil consumption issues. 12-16 labor hours. Frequently done during engine rebuild as preventive measure since engine is already apart.

Estimated cost: $2,200-3,800