1997 NISSAN LAUREL

Typical onset: 80,000-150,000 mi

Symptoms: Cold-start ticking/clattering that may persist after warmup, Loss of power at higher RPM, Check engine light for cam/crank correlation codes, Ticking worsens progressively over weeks/months

Fix: RB25 lifters fail from wear and oil starvation. Requires valve cover removal, cam removal, shim-under-bucket setup means full lifter replacement and valve clearance adjustment. 6-9 hours labor for all 12 lifters plus gaskets and oil change. Many shops do all lifters at once rather than chase individuals.

Estimated cost: $800-1,400

Typical onset: 100,000-180,000 mi

Symptoms: White smoke from exhaust, Coolant consumption without visible leaks, Oil milkshake (coolant in oil), Overheating under load, Bubbles in coolant reservoir when running

Fix: RB25DE/DET head gaskets blow between cylinders 5-6 or into coolant passages when cooling system maintenance is neglected or radiator/water pump fail. Requires head removal, resurface (usually warped 0.003-0.008 inches), new gasket set, timing components inspection, coolant flush. 12-16 hours labor. On turbo cars, check turbo seals while head is off.

Estimated cost: $1,800-2,800

Typical onset: 70,000-120,000 mi

Symptoms: Severe clunk when shifting from Park to Drive/Reverse, Vibration through chassis at idle in gear, Visible transmission sag when inspecting from below, Shifter feels loose or notchy

Fix: Rubber transmission mount deteriorates from age and torque cycling, especially on DET models. Trans sags rearward, stressing driveline and exhaust hangers. Requires trans support, mount replacement, sometimes driveshaft removal for access. 2-3 hours labor. Replace engine mounts at same time if they're original—labor overlap saves money.

Estimated cost: $300-550

Symptoms: ATF puddle under front of vehicle, Transmission slipping or delayed engagement, Pink/milky ATF (if cooler is in radiator and it's leaking internally), Sudden loss of forward gears

Fix: Steel lines rust through at bends near radiator, or internal cooler in radiator fails mixing ATF and coolant (death sentence for transmission). External line replacement: 1-2 hours. Internal failure requires radiator replacement, complete trans flush/filter, sometimes full trans rebuild if contamination spread. Catch it early or budget for transmission replacement.

Estimated cost: $200-400 for lines; $2,500-4,000 if cooler contaminated transmission

Typical onset: 120,000-180,000 mi

Symptoms: Serpentine belt shredding repeatedly, Vibration at idle worsening over time, Visible wobble of crank pulley when engine running, Squealing from front of engine, Rubber ring separating from outer pulley

Fix: Rubber damper layer delaminates causing pulley to wobble and destroy belts. If outer ring separates completely, can damage radiator, AC lines, or timing cover. Requires pulley puller and installer tool, new balancer, belts, often water pump and tensioner while you're there. 3-4 hours labor. Do NOT drive if wobble is visible—can throw the pulley.

Estimated cost: $400-700

Typical onset: 150,000+ mi

Symptoms: Severe top-end noise beyond lifter tick, Metal shavings in oil, Low oil pressure at idle, Loss of compression in multiple cylinders

Fix: Occurs from prolonged oil starvation or wrong oil weight in high-mileage engines. Cam lobes wear flat, cam journals score the caps. Requires cylinder head removal, cam replacement, possibly new cam caps and head machining if scoring is deep. Often discovered during head gasket jobs. 14-18 hours labor if head needs machine work.

Estimated cost: $2,200-3,800