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2018 TOYOTA TUNDRA

4.6L V8•4WD•AUTOMATIC•gas
5-Year Cost of Ownership
$9,940 maintenance + known platform issues
~$1,988/yr · 170¢/mile equivalent · $6,258 maintenance + $2,482 expected platform issues
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3.4L V6 Twin Turbo Hybrid
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Common Problems & Known Issues

The 2018 Tundra with the 5.7L 3UR-FE is generally bulletproof, but a small percentage suffer catastrophic cam tower failures, and the 6-speed transmission develops cooler line and mount issues with age. The 4.6L is rock-solid but rare in this year.

Cam Tower / Camshaft Failure (5.7L 3UR-FE)

Rare · high severity
Typical onset: 40,000-90,000 mi
Symptoms: Sudden loud ticking or knocking from valve train, Metal shavings in oil, Check engine light with camshaft position codes, Catastrophic engine failure if driven after symptoms appear
Fix: Complete engine rebuild or replacement. Cam tower cracks allow oil starvation to cam bearings, destroying camshafts, rockers, and often spreading debris through the entire engine. Requires cylinder head removal minimum (18-25 hrs), but contaminated oil usually means full short block replacement (35-45 hrs). Toyota extended warranty to 10yr/150k on some VINs but not all 2018s are covered.
Estimated cost: $8,000-15,000

Transmission Oil Cooler Line Corrosion

Common · medium severity
Typical onset: 80,000-150,000 mi
Symptoms: Transmission fluid leak near radiator or frame rail, Pink fluid puddles under truck, Low transmission fluid warning or delayed shifts, Visible corrosion on steel cooler lines at bends
Fix: Replace corroded cooler lines from transmission to radiator. Lines run along frame and rot from road salt and stone impacts. 3-5 hrs labor. If leak goes unnoticed and transmission runs low, you're looking at internal damage and rebuild.
Estimated cost: $400-800

Rear Transmission Mount Failure

Common · low severity
Typical onset: 60,000-120,000 mi
Symptoms: Clunk when shifting from Park to Drive or Reverse, Vibration at idle in gear, Driveline shudder on acceleration, Visible tearing or separation of rubber mount
Fix: Replace rear transmission crossmember mount. The rubber isolator tears from torque cycling, especially on trucks that tow. 1.5-2.5 hrs labor. Often done with a full transmission service while you're under there.
Estimated cost: $250-450

Secondary Air Injection Pump Failure

Occasional · low severity
Typical onset: 100,000-160,000 mi
Symptoms: Check engine light with P0410 or P0418 codes, Loud buzzing or grinding noise on cold start for 60-90 seconds, Emissions test failure in states that monitor readiness, No driveability impact
Fix: Replace secondary air injection pump and check valve assembly. Pump seizes from corrosion or check valve fails allowing exhaust gas backflow. 2-3 hrs labor. Truck runs fine without it but won't pass emissions in some states.
Estimated cost: $800-1,200

Exhaust Manifold Stud/Bolt Corrosion and Breakage

Occasional · low severity
Typical onset: 90,000-180,000 mi
Symptoms: Loud ticking or exhaust leak sound from engine bay on cold start, Smell of exhaust in cabin, Visible soot streaks on manifold, Sound diminishes as engine warms up
Fix: Extract broken manifold studs and replace. Studs corrode and snap from heat cycling. Extraction on the 5.7L is straightforward if caught early (4-6 hrs per side), nightmare if studs break flush and require head removal (12-18 hrs per side). Address at first sign of leak before studs seize completely.
Estimated cost: $600-1,200 if caught early, $2,500-4,000 if head removal needed

Brake Booster Check Valve Failure

Occasional · medium severity
Typical onset: 70,000-130,000 mi
Symptoms: Hard brake pedal requiring excessive effort, Hissing sound from under dash when braking, Engine stalling when coming to a stop, Vacuum leak codes or rough idle
Fix: Replace brake booster check valve or entire booster assembly. Check valve fails and loses vacuum assist. Valve alone is 0.5 hrs, full booster is 2-3 hrs if internal diaphragm is compromised.
Estimated cost: $80-200 valve only, $600-900 full booster
Owner tips
  • Check cam tower TSB eligibility immediately on any used 5.7L — this is your biggest financial risk and not all VINs got the extended coverage
  • Inspect transmission cooler lines during every oil change after 80k; catch corrosion before the leak
  • Use Toyota WS transmission fluid only; aftermarket ATF causes shift issues in the AB60
  • Address exhaust manifold ticking immediately; waiting turns a $700 job into a $4,000 nightmare
Buy with confidence if the cam tower TSB was applied or VIN confirms coverage; otherwise budget $10k reserve for potential engine replacement on the 5.7L — when they're good, they run 300k, but the rare failures are catastrophic.
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.
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