1998 NISSAN LAUREL

Typical onset: 80,000-120,000 mi

Symptoms: Clunking when shifting from Park to Drive or Reverse, Excessive vibration at idle, especially with A/C on, Visible engine movement when revving in neutral

Fix: Transmission mount is the usual culprit and fails first due to age and heat. Replace transmission mount (1.5 hours), inspect and often replace front engine mount simultaneously (add 1 hour). These rubber mounts harden and tear after 20+ years regardless of mileage.

Estimated cost: $300-600

Typical onset: 100,000-150,000 mi

Symptoms: Ticking or tapping noise from valve cover area, especially cold start, Noise persists after warm-up if lifters are collapsed, May quiet down temporarily with fresh oil, then return

Fix: RB25DE/DET hydraulic lifters wear or stick from old oil and varnish buildup. Replacing all 12 lifters requires valve cover removal, cam caps off, shims documented (4-6 hours). Often find camshaft lobe wear if noise ignored long-term. Single lifter replacement is 2-3 hours but rarely solves the problem completely.

Estimated cost: $800-1,400

Typical onset: 120,000+ mi

Symptoms: White smoke from exhaust on cold start, Coolant loss with no visible leaks, Milky oil or oil in coolant overflow tank, Overheating or persistent bubbles in radiator

Fix: RB25DET turbo motors boosted hard or overheated will blow head gaskets between cylinders 5-6 or into coolant passages. Head gasket job requires cylinder head removal, resurface head (often warped .003-.008 inches), new gasket kit, ARP studs recommended (12-16 hours total). Check head for cracks while off. NA RB25DE sees this less often.

Estimated cost: $2,200-3,800

Typical onset: 90,000+ mi

Symptoms: ATF drips or stains on driveway under front of car, Low transmission fluid level on dipstick, Transmission slipping or delayed engagement if neglected

Fix: Steel lines to external ATF cooler corrode at fittings and flare seats, especially in rust-belt imports. Replace both lines as a pair (2-3 hours), sometimes requires dropping crossmember for access. Inspect radiator-mounted cooler for internal leaks while you're in there—ATF in coolant will kill the transmission.

Estimated cost: $350-700

Typical onset: 100,000-140,000 mi

Symptoms: Visible rubber separation between hub and outer ring, Serpentine belt shredding or throwing off, Rough idle vibration that wasn't there before, Wobbling crank pulley visible with engine running

Fix: RB25 harmonic balancer rubber deteriorates with age, causing outer ring to slip or separate. This can damage crank snout or trigger timing issues. Removal requires special puller and often heat (2-3 hours). If balancer separates completely while driving, you're calling a tow truck. Inspect every oil change after 90k miles.

Estimated cost: $400-750

Symptoms: Hesitation or stumble under acceleration, Hard starting after sitting overnight, Loss of power at highway speeds

Fix: Many JDM imports arrive with original fuel filter that's 25+ years old. Filter is inline under chassis near fuel tank (0.5-1 hour). Expect rust flakes and varnish inside. Replace immediately on any fresh import—it's cheap insurance against fuel pump damage.

Estimated cost: $80-150

Typical onset: 80,000+ mi

Symptoms: Radiator hose leaks or soft/squishy hoses, Weeping coolant from water pump, Overheating in traffic or under load

Fix: These 25+ year old cooling systems are living on borrowed time. Budget for radiator, all hoses, thermostat, and water pump as a package deal when you buy the car (4-6 hours for everything). Turbos especially cannot tolerate overheating. Don't chase leaks one at a time—do it all.

Estimated cost: $800-1,400