1995 NISSAN 300ZX

Typical onset: 80,000-120,000 mi

Symptoms: white smoke from exhaust, coolant loss with no visible leak, rough idle when warm, oil in coolant reservoir

Fix: Head gasket job on the VG30DETT requires pulling the engine due to firewall clearance—no way around it. Expect 25-35 hours labor to remove engine, replace both head gaskets, resurface heads, replace timing belt and water pump while it's out. Often reveals cracked heads if overheated severely.

Estimated cost: $4,500-7,500

Typical onset: 100,000-150,000 mi

Symptoms: blue smoke on acceleration, loss of boost pressure, whining or grinding noise from engine bay, oil leaking from turbo area

Fix: Factory turbos fail from oil starvation when feed lines crack or coke up. Replacing both turbos with gaskets and new oil/coolant lines is 18-24 hours because you're working in a 6-inch space between engine and firewall. Many owners upgrade to aftermarket units during this job.

Estimated cost: $3,500-6,000

Typical onset: 60,000-100,000 mi

Symptoms: transmission fluid puddles under car, burnt ATF smell, low fluid warning or slipping, red fluid on crossmember

Fix: Steel hardlines rust through at the fittings or rubber sections crack. Automatic models lose fluid quickly. Lines run through cramped areas requiring removal of undertray and partial exhaust work. 4-6 hours labor to replace lines and top off fluid.

Estimated cost: $600-1,200

Typical onset: 90,000-130,000 mi

Symptoms: rough idle, hesitation under boost (turbo), check engine light with rich/lean codes, hard starting when hot

Fix: Fuel filter is buried under the intake manifold—Nissan's cruel joke. Injectors clog or leak on high-mileage cars. Filter replacement alone is 3-4 hours; injector service adds another 2-3 hours per side. Many techs do intake manifold gaskets at same time since it's already apart.

Estimated cost: $800-1,800

Typical onset: 60,000-90,000 mi

Symptoms: squealing from front of engine, coolant leaks at water pump, catastrophic no-start if belt snaps (interference engine)

Fix: This is an interference engine—belt failure means bent valves and possible piston damage. Timing belt service requires 8-12 hours due to accessory removal and tight working space. Always replace water pump, tensioner, and idler pulleys simultaneously. Turbo models take longer because of intercooler piping removal.

Estimated cost: $1,200-2,200

Typical onset: 70,000-110,000 mi

Symptoms: clunking when shifting or accelerating, excessive engine movement visible from engine bay, vibration at idle, transmission thunk when engaging drive

Fix: Rubber mounts deteriorate from heat and age. Transmission mount is worst offender—2 hours labor. Engine mounts require jacking the engine and working around tight firewall clearances—4-6 hours for all three. Polyurethane upgrades available but increase NVH.

Estimated cost: $600-1,400

Symptoms: intermittent no-start, gauges reading incorrectly or dead, power windows or locks failing randomly, corrosion in engine bay connectors

Fix: The Power Transistor Unit (PTU) under the coil packs fails from heat cycling—3 hours labor to diagnose and replace. Main engine harness insulation becomes brittle and cracks, causing shorts. Full harness replacement is 12-16 hours and requires engine removal on turbos. Most techs patch individual circuits as they fail.

Estimated cost: $400-2,500

Typical onset: 80,000-120,000 mi

Symptoms: clunking over bumps from rear, wandering rear end under acceleration, uneven rear tire wear

Fix: Subframe bushings crack and differential mounts sag. Requires dropping exhaust and rear subframe—8-10 hours labor. Aluminum subframe can crack at bushing mounts if driven hard; inspect carefully. Solid or polyurethane replacements are common upgrades.

Estimated cost: $1,000-1,800