1999 NISSAN GLORIA

Typical onset: 80,000-140,000 mi

Symptoms: Loud ticking or tapping from valve covers at startup that persists, Metal shavings in oil during changes, Check engine light with cam position sensor codes, Loss of power and rough idle in advanced cases

Fix: VQ30DD uses bucket-over-shim lifters that wear camshaft lobes when oil changes are neglected. Requires both heads off, cam replacement, all 24 lifters, resurface if warped. 18-24 labor hours depending on condition. This is THE killer repair on these cars.

Estimated cost: $3,500-6,000

Typical onset: 100,000-150,000 mi

Symptoms: Blue smoke on acceleration or deceleration, Turbo whine or grinding noise under boost, Oil consumption over 1 quart per 1,000 miles, Loss of boost pressure

Fix: Factory oil return line routing allows coking in the turbo. Turbo replacement requires pulling exhaust manifold, downpipe, and often the cylinder head for proper stud extraction. Also inspect oil pump while you're in there. 12-16 hours labor.

Estimated cost: $2,800-4,200

Typical onset: 70,000-110,000 mi

Symptoms: Clunking when shifting from park to drive, Excessive vibration at idle in gear, Transmission shifter feels loose or notchy, Visible sagging of transmission tailshaft

Fix: Rubber mounts collapse and crossmember bushings crack. Entire transmission must be supported to replace mount and crossmember bushings. While you're under there, inspect the oil cooler lines. 3-5 hours labor.

Estimated cost: $450-800

Symptoms: Red fluid pooling under engine bay, Transmission slipping or delayed engagement, Burnt transmission fluid smell, Transmission overheating warning if equipped

Fix: Steel lines rust through at fittings and bends, especially in salt states. Failure dumps all ATF quickly. Replace both hard lines and rubber sections, flush cooler. Often discovered too late after transmission damage. 4-6 hours if caught early, add 15+ for transmission rebuild if run dry.

Estimated cost: $600-1,200

Typical onset: 120,000-180,000 mi

Symptoms: White smoke from exhaust on cold start, Coolant loss with no visible leaks, Overheating under load, Oil looks milky or coolant looks oily

Fix: VQ30DD runs hot and head gaskets fail between cylinders or into coolant passages. Both heads must come off, should be resurfaced, and timing chains inspected while apart. If you're doing this, address the cam/lifter issue simultaneously. 16-22 hours labor.

Estimated cost: $3,200-5,500

Typical onset: 90,000-140,000 mi

Symptoms: Vibration at idle that increases with RPM, Serpentine belt misalignment or squealing, Visible wobble of crank pulley, Rubber ring separation visible on inspection

Fix: RB25DET balancer rubber deteriorates and separates. Can damage front main seal and timing components if left too long. Requires removal of accessories and radiator for clearance. 4-6 hours labor.

Estimated cost: $600-950