1998 LEXUS SC 400

Typical onset: 80,000-150,000 mi

Symptoms: Pink or red fluid puddle under engine bay center, Transmission slipping or delayed engagement, Milky/strawberry transmission fluid (coolant contamination), Overheating transmission or engine

Fix: The steel cooler lines rust through where they connect to the radiator, mixing coolant and ATF. Must replace both lines and flush both systems thoroughly. If coolant entered trans, internal damage likely. 3-4 hours labor for lines only, 8-12+ if trans needs rebuild.

Estimated cost: $600-1,200 for lines/flush, $2,500-4,500 if transmission damaged

Typical onset: 120,000-200,000 mi

Symptoms: Deep knocking sound from lower engine that increases with RPM, Metallic rattle on cold start that persists, Low oil pressure warning, Metal shavings in oil or filter

Fix: Often caused by sludge buildup from neglected oil changes or running conventional oil. Bearings starve and spin. Requires engine-out rebuild with new bearings, rod/main work, possibly pistons. 25-35 hours labor. Some shops do in-frame bearing replacement (18-22 hours) if journals are clean, but risky.

Estimated cost: $4,500-8,000

Typical onset: 90,000-140,000 mi

Symptoms: Oil smell after driving, especially on hot days, Oil residue on back of engine near firewall, Smoke from engine bay after hard driving, Oil drips on exhaust manifolds

Fix: Valve cover gaskets harden and leak. Cam seals also seep. Not urgent but will worsen and can cause fires if oil hits exhaust. Valve covers require removing intake plenum. 6-8 hours for both covers and cam seals done right.

Estimated cost: $1,200-1,800

Typical onset: 100,000-180,000 mi

Symptoms: Clunk when shifting from Park to Drive or Reverse, Vibration at idle in Drive, Excessive drivetrain movement over bumps, Visible sagging of transmission tailshaft

Fix: The rear trans mount deteriorates and the rubber separates. Easy diagnosis: look under car, you'll see the trans sitting low. Requires lift and support of transmission. 2-3 hours labor.

Estimated cost: $400-700

Typical onset: 100,000-160,000 mi

Symptoms: Rough idle or misfire under load, Hesitation on acceleration, Check engine light with P030X misfire codes, Hard starting when engine is hot

Fix: The 1UZ uses a distributor-per-bank setup. Caps crack, rotors corrode, plug wires arc. Coils rarely fail but wires and caps are common. Do all ignition components together. 3-4 hours for full tune including caps, rotors, wires, plugs.

Estimated cost: $600-1,000

Typical onset: 120,000-180,000 mi

Symptoms: Whining noise on cold starts or turning, Fluid drips from front of engine low passenger side, Heavy steering feel intermittently, Foamy or low PS fluid reservoir

Fix: Pump seals age out and leak. Noise often from air ingestion through leaking seals or low fluid. Replacement pump and pressure hose recommended. 2-3 hours labor.

Estimated cost: $500-850

Typical onset: 150,000+ mi

Symptoms: Hesitation or stumbling under hard acceleration, Difficulty starting after sitting, Surging at highway speeds, Fuel pump whine getting louder

Fix: The main filter is inside the tank with the pump assembly. Often neglected since there's no serviceable inline filter. Requires tank drop. If pump is also worn (common at this mileage), replace both together. 4-5 hours labor.

Estimated cost: $800-1,400 with pump, $400-600 filter only