Free API

2018 LEXUS RC 350

3.5L V6•RWD•AUTOMATIC•gas
Be the first sponsor for this vehicle

For $99, we generate the full set of step-by-step repair procedures for this exact vehicle. Free for everyone, forever, with your name on every one.

Sponsor — $99
Dead battery / stuck in Park? Emergency neutral procedure for this RC 350 →
5-Year Cost of Ownership
$23,487 maintenance + known platform issues
~$4,697/yr · 390¢/mile equivalent · $6,345 maintenance + $1,442 expected platform issues

Common Problems & Known Issues

The 2018 RC 350 shares the bulletproof 2GR-FSE V6 and 8-speed auto from the GS/IS family, making it mechanically solid overall. The main concern is carbon buildup on direct-injection intake valves and some transmission cooler leaks, but catastrophic failures are rare if maintained properly.

Direct Injection Carbon Buildup on Intake Valves

Common · medium severity
Typical onset: 60,000-90,000 mi
Symptoms: Rough idle or misfires on cold start, Reduced power and throttle response, Check engine light with multiple misfire codes (P0300-P0306)
Fix: Walnut blasting the intake valves is the proper fix—requires intake manifold removal and 4-6 hours of labor. Catch-can installation during the job helps prevent recurrence.
Estimated cost: $600-1,200

Transmission Oil Cooler Line Leaks

Occasional · medium severity
Typical onset: 70,000-110,000 mi
Symptoms: ATF puddles under engine bay, driver side, Low transmission fluid warning on instrument cluster, Harsh or delayed shifting if fluid gets low
Fix: The cooler lines corrode where they mount to the radiator or near heat shields. Replacement involves both lines and fittings—about 2-3 hours. Inspect carefully during any radiator work.
Estimated cost: $400-800

Transmission Mount Deterioration

Occasional · low severity
Typical onset: 80,000-120,000 mi
Symptoms: Clunk or thud when shifting from Park to Drive/Reverse, Vibration at idle that smooths out under load, Visible cracking or oil saturation on the rubber mount
Fix: The rear transmission mount wears from heat and stress. Replacement is straightforward—1.5-2 hours with a lift. OEM mounts last longer than aftermarket.
Estimated cost: $250-450

Fuel Pump Recall and Related Failures

Occasional · high severity
Symptoms: Stalling at idle or while driving (can be dangerous), No-start condition with cranking but no fuel pressure, Rough running or hesitation under acceleration
Fix: NHTSA recall for fuel pump impeller cracking. Check VIN for open recall—dealer replaces pump at no charge. If not recalled and pump fails later, it's 2-3 hours labor for in-tank pump replacement.
Estimated cost: $0 (recall) or $600-1,000 (post-warranty)

Water Pump Weeping (2GR-FSE Specific)

Occasional · medium severity
Typical onset: 90,000-130,000 mi
Symptoms: Coolant smell from engine bay, especially after hot shutdown, Small pink drips visible below water pump area, Slow coolant loss over weeks or months
Fix: The water pump on this V6 runs internally and can develop seal leaks. Requires timing cover removal and timing chain work—6-8 hours of labor. Do the serpentine belt and thermostat at the same time.
Estimated cost: $1,200-1,800
Owner tips
  • Run Top Tier gas and consider adding a catch-can by 40k miles to minimize carbon buildup—saves a walnut blast later
  • Check transmission fluid color annually; the 8-speed runs hot and benefits from a fluid/filter service at 60k miles despite the 'lifetime fill' claim
  • Inspect oil cooler lines and trans cooler lines during any underbody service—corrosion can start early in salt states
  • Address the fuel pump recall immediately if open; this is a safety issue that can strand you
Solid luxury coupe with few serious issues—buy one with service records showing carbon cleaning or plan for it, and you'll have a reliable performer well past 150k miles.
AI-assisted summary drawn from NHTSA recall data, our labor-times database, and platform knowledge. Not a substitute for a pre-purchase inspection on a specific vehicle.

Labor Times — 2018 Lexus RC 350

473 jobs across 17 categories

body (31)

brakes (39)

cooling (21)

drivetrain (25)

electrical (75)

engine (67)

hvac (23)

interior (24)

maintenance (31)

suspension (42)

transmission (30)

🔧 Built by master technician Chris Hackleman · Master Technician · 20+ years.
Stuck on a repair? Take it to The Diag Desk — ask a master tech about this exact car → real human answer within 24h, never AI
Building an app?
Free API access to all this data — 10 requests/day, no card required.
Get an API key →
Run a shop?
Manage repairs, estimates, and customers with ShopBase — $249/mo, all features included. Built by the same team.
Try ShopBase →