2007 PORSCHE CAYENNE S

Typical onset: 60,000-120,000 mi

Symptoms: Blue smoke on cold start that clears after warmup, Excessive oil consumption (1 qt per 500-1000 miles), Rough idle when cold, Loss of compression, Eventual bearing failure and complete engine seizure

Fix: The M48 engine suffers from nikasil cylinder liner scoring due to poor piston/bore clearances and sulfur in fuel. No fix short of full engine rebuild with sleeved cylinders or factory short block replacement. Expect 40-60 labor hours for rebuild, 25-35 hours for short block swap. Many owners install LN Engineering Nickies liners or IPD plenum.

Estimated cost: $12,000-22,000

Typical onset: 80,000-140,000 mi

Symptoms: Milky or frothy transmission fluid, Coolant loss with no visible leaks, Transmission slipping or harsh shifts, Sweet smell from tailpipe, Overheating transmission

Fix: Internal cooler inside the radiator end tank fails, allowing coolant into ATF and vice versa. Requires radiator replacement, complete transmission flush (often multiple flushes), new filter and pan gasket. If coolant circulated long in trans, internal damage likely. 6-10 hours labor depending on damage assessment.

Estimated cost: $1,800-3,500

Typical onset: 70,000-110,000 mi

Symptoms: Clunk when shifting from Park to Drive or Reverse, Excessive drivetrain movement felt through cabin, Vibration at idle in gear, Visible tearing or fluid leaking from mount

Fix: Hydraulic transmission mount collapses internally, allowing excessive powertrain movement. Replacement is straightforward but requires supporting transmission. 2-3 hours labor. OEM mount recommended over aftermarket.

Estimated cost: $600-900

Typical onset: 100,000-150,000 mi

Symptoms: Rattling noise from front of engine on cold start, Check engine light with cam correlation codes, Metallic rattling at idle, Sudden loss of power if chain jumps

Fix: Plastic chain guides wear and tensioners lose pressure, allowing chain slap. Can cause catastrophic valve-to-piston contact if chain jumps. Requires front engine disassembly, all guides, tensioners, and chains replaced. 18-25 hours labor. Often done during bore scoring repair.

Estimated cost: $4,500-7,000

Typical onset: 80,000-130,000 mi

Symptoms: Coolant puddles under vehicle, Sweet smell in cabin or engine bay, Overheating or low coolant warnings, Visible green coolant on engine valley or subframe

Fix: Plastic coolant pipes and quick-connect fittings become brittle and crack, especially in engine valley and near firewall. Some require intake manifold removal for access. 3-8 hours depending on location. Replace all suspect pipes preventively once one fails.

Estimated cost: $800-2,200

Typical onset: 90,000-140,000 mi

Symptoms: Vehicle sits low at one corner or all around after sitting, Compressor runs constantly, Suspension fault message on dash, Hissing sound near wheel wells or compressor

Fix: Air struts develop leaks at bellows or fittings, compressor wears out from overwork. Compressor replacement 2-3 hours, single strut 2-3 hours, airlines require body disassembly. Many owners convert to coil springs for $2,000-3,000 to eliminate future issues.

Estimated cost: $1,200-2,800 per corner for strut; $1,800-2,500 for compressor