2015 LEXUS RX 350

Typical onset: 60,000-120,000 mi

Symptoms: Burning more than 1 quart per 1,000 miles, often worsening rapidly, Blue smoke from exhaust on startup or acceleration, Check engine light for lean codes or misfires, Catastrophic engine failure if oil level drops unnoticed

Fix: Piston ring replacement requires full engine disassembly (15-20 hours). Many shops recommend short block or complete engine replacement given labor cost and potential cylinder wall damage. Toyota issued TSB and extended warranty to 10yr/150k for some VINs, but 2015s often fall outside coverage.

Estimated cost: $4,500-8,000

Typical onset: 80,000-150,000 mi

Symptoms: Transmission fluid puddles under vehicle, typically front-center, Burnt transmission fluid smell, Transmission overheating warnings on dash, Pink or red fluid visible on cooler lines near radiator

Fix: Replace leaking cooler lines and top off ATF. Lines corrode at crimp joints or where they contact frame. Straightforward job, 2-3 hours including fluid replacement and inspection of radiator-mounted cooler for cross-contamination.

Estimated cost: $400-700

Typical onset: 100,000-140,000 mi

Symptoms: Clunk or thud when shifting from Park to Drive/Reverse, Excessive vibration at idle, especially in Drive with brake applied, Visible sagging or torn rubber on mount during inspection

Fix: Replace rear transmission mount. Requires raising engine slightly with support fixture. 2-2.5 hours labor. OEM mounts last longer than aftermarket in this application.

Estimated cost: $350-550

Typical onset: 90,000-130,000 mi

Symptoms: Coolant seepage from weep hole on pump body, Coolant smell after driving, Slow coolant loss requiring periodic top-offs, Bearing noise (rare, but indicates imminent failure)

Fix: Replace water pump, timing belt (if not done), and coolant. Belt is interference design; pump failure risks belt contamination. Full timing service is 4-5 hours. Always replace thermostat and drive belts simultaneously.

Estimated cost: $800-1,400

Typical onset: 80,000-120,000 mi

Symptoms: Clunking over bumps from front suspension, Steering wander or vague on-center feel, Uneven or feathered inner tire wear, Visible cracking in rubber bushings during inspection

Fix: Replace front lower control arms (bushings not serviceable separately on most aftermarket arms). 2-3 hours including alignment. OEM arms are expensive; quality aftermarket acceptable here.

Estimated cost: $600-1,000

Typical onset: 100,000+ mi

Symptoms: Rough idle or stumble on cold start, Misfires on specific cylinders (P0300-P0306 codes), Slight fuel smell in cabin or engine bay, Reduced fuel economy

Fix: Replace leaking injector seals (1.5-2 hours) or perform intake valve carbon cleaning via walnut blasting (3-4 hours). Direct injection engines in this generation accumulate carbon since fuel doesn't wash valves. Catch can installation helps prevent recurrence.

Estimated cost: $400-900