The 2006 Mitsubishi Endeavor with its 3.8L V6 suffers from catastrophic engine oil consumption and piston ring failure that can grenade the motor, plus transmission cooler line failures that destroy the 4-speed automatic. These aren't minor issues—they're platform killers that show up between 80,000-140,000 miles.
Piston Ring Failure and Severe Oil Consumption
Common · high severity
Typical onset: 80,000-140,000 mi
Symptoms: Excessive oil consumption (1 quart per 500-1,000 miles), Blue smoke from exhaust on startup and acceleration, Fouled spark plugs and misfires, Eventually leads to spun bearings or total engine seizure if oil level drops unnoticed
Fix: Requires complete engine rebuild with new piston rings, cylinder honing, and often new pistons. Many owners opt for used engine swap due to labor cost. Engine rebuild: 18-24 labor hours. Used engine R&R: 12-16 hours.
Estimated cost: $3,500-6,500
Transmission Oil Cooler Line Failure
Common · high severity
Typical onset: 70,000-120,000 mi
Symptoms: Transmission fluid leaking from lines near radiator, Pink or red fluid pooling under vehicle, Transmission slipping or delayed engagement if fluid level drops, Overheating transmission, burnt ATF smell
Fix: Replace both cooler lines preventively—they corrode where they connect to steel fittings. If leak contaminates transmission, you're looking at rebuild or replacement. Lines only: 2-3 hours. Transmission rebuild if damaged: 12-16 hours.
Symptoms: Severe clunking when shifting from Park to Drive or Reverse, Vibration through cabin at idle, Visible engine/transmission sag when inspecting from below, Excessive drivetrain movement during acceleration
Fix: Rear transmission mount deteriorates and separates. Replacement requires supporting transmission and unbolting old mount. Check all motor mounts while you're in there. 2-3 hours labor.
Estimated cost: $250-450
Ignition Coil and Spark Plug Failure
Occasional · medium severity
Typical onset: 60,000-100,000 mi
Symptoms: Check engine light with P0300-P0306 misfire codes, Rough idle and hesitation under load, Poor fuel economy, Often triggered or accelerated by oil fouling from piston ring issues
Fix: Replace all six coils and plugs as a set—don't chase individual cylinders. If oil consumption issue exists, this becomes a recurring problem. 1.5-2 hours labor.
Estimated cost: $400-700
Rear Differential Pinion Seal Leak
Occasional · low severity
Typical onset: 100,000-160,000 mi
Symptoms: Gear oil dripping from front of rear differential, Oil spots on driveway centered under rear axle, Whining noise from rear end if fluid level drops significantly
Fix: Pinion seal fails due to age. Requires removing driveshaft and pressing new seal. Check fluid level and condition—burnt fluid means bearing damage. 2-3 hours labor.
Estimated cost: $300-500
Fuel Filler Neck Corrosion and Leaks
Occasional · medium severity
Symptoms: Fuel smell near rear quarter panel, Check engine light with evaporative emission codes (P0440-P0456), Visible rust or fuel staining on filler neck, Difficulty inserting gas pump nozzle
Fix: Filler neck and hose assembly corrode in salt-belt states. Recall covered some units but not all. Replacement involves dropping fuel tank or removing spare tire well components. 2-4 hours labor depending on rust.
Estimated cost: $400-800
Owner tips
Check oil level every 500 miles religiously—this engine WILL consume oil even when 'healthy,' and low oil kills bearings fast
Inspect transmission cooler lines at every oil change for corrosion—replace before they burst
Budget for a short block or used engine if buying over 100k miles; the piston ring issue is not preventable with maintenance
Avoid this vehicle in salt-belt states—corrosion accelerates fuel system and brake line failures significantly
Hard pass unless you're getting it for scrap value and can swap the engine yourself—the oil consumption issue is a ticking time bomb that makes this one of Mitsubishi's worst reliability years.
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.
Be the first to unlock repairs for the 2006 Mitsubishi Endeavor
Procedures haven't been generated for this vehicle yet. Become the founding sponsor and we'll generate expert-grade, step-by-step repair walkthroughs for every common job on it — free for every mechanic and DIYer who looks it up after, forever.
MITSUBISHI IS RECALLING CERTAIN MODEL YEAR 2006-2008 ENDEAVOR WITH MANUAL AIR CONDITIONING. DUE TO AN INCORRECT HEATER (HVAC) CONTROLLER SIGNAL, THE AIR FLOW FROM THE AIR VENTS MAY RANDOMLY CHANGE DIRECTION AND/OR THE TEMPERATURE MAY BRIEFLY CYCLE BETWEEN HOT AND COLD.
Consequence: THIS CONDITION COULD AFFECT DEFROSTER PERFORMANCE, RESULTING IN POOR WINDSHIELD VISIBILITY AND POTENTIALLY CAUSE A CRASH.
Remedy: DEALERS WILL INSPECT FOR DAMAGE AND IF NECESSARY REPAIR THE MODE DOOR SHAFT FREE OF CHARGE. THE SAFETY RECALL BEGAN ON DECEMBER 7, 2010. OWNERS MAY CONTACT MITSUBISHI AT 1-800-222-0037.
FUEL SYSTEM, GASOLINE:STORAGE:TANK ASSEMBLY:FILLER PIPE AND CAP · 10V065000
2010-02-25 · PE09056
MITSUBISHI IS RECALLING CERTAIN MODEL YEAR 2004-2010 ENDEAVOR VEHICLES ORIGINALLY SOLD IN OR CURRENTLY REGISTERED IN THE STATES OF CONNECTICUT, DELAWARE, ILLINOIS, INDIANA, IOWA, KENTUCKY, MAINE, MARYLAND, MASSACHUSETTS, MICHIGAN, MINNESOTA, MISSOURI, NEW HAMPSHIRE, NEW JERSEY, NEW YORK, OHIO, PENNSYLVANIA, RHODE ISLAND, VERMONT, VIRGINIA, WEST VIRGINIA, WISCONSIN, AND WASHINGTON D.C. COLD STATES INCLUDE NORTH DAKOTA, SOUTH DAKOTA, NEBRASKA, KANSAS, OKLAHOMA, COLORADO, WYOMING, MONTANA, IDAHO, WASHINGTON, OREGON, AND UTAH. ADJOINING STATES INCLUDE ARKANSAS, TENNESSEE, AND NORTH CAROLINA.
IN SEVERE CORROSIVE ENVIRONMENTS WHERE ROAD SALTS ARE FREQUENTLY USED IN WINTER VEHICLES MAY BE EXPOSED TO ROAD DEBRIS (MUD) MIXED WITH ROAD SALT. THIS MATERIAL CAN BECOME TRAPPED BETWEEN A REINFORCING BRACKET AND THE FUEL FILLER PIPE, POTENTIALLY CAUSING CORROSION. OVER TIME, CORROSION COULD CREATE A LEAK IN THE FUEL FILLER PIPE THAT COULD RESULT IN A FUEL LEAKAGE WHEN FUELING THE VEHICLE.
Consequence: FUEL LEAKAGE, IN THE PRESENCE OF AN IGNITION SOURCE, COULD RESULT IN A FIRE.
Remedy: DEALERS WILL REPLACE THE FUEL FILLER PIPE WITH A NEW IMPROVED PART FREE OF CHARGE. THE SAFETY RECALL IS EXPECTED TO BEGIN ON OR BEFORE JULY 5, 2010. OWNERS MAY CONTACT MITSUBISHI AT 1-800-222-0037.
MITSUBISHI IS RECALLING 45,988 MY 2005-2007 ENDEAVOR, GALANT, ECLIPSE COUPE, AND MY 2007 ECLIPSE SPYDER VEHICLES. THE BRACKET THAT IS THE ATTACHMENT POINT FOR THE LEFT REAR FUEL TANK MOUNTING STRAP MAY HAVE BEEN IMPROPERLY FORMED DURING A METAL STAMPING PROCESS. THE PROCESS MAY HAVE CAUSED THE METAL TO HAVE A SPLIT IN THE AREA WHERE THE BOLT THAT HOLDS ONE OF THE TWO FUEL TANK STRAPS TO THE UNDERSIDE OF THE VEHICLE IS LOCATED. IN THE EVENT THE FUEL TANK IS FULL AND THE VEHICLE IS SUBJECT TO A SEVERE COLLISION, THE BRACKET MAY BREAK AND ALLOW THE FUEL TANK TO DROP DOWN, POSSIBLY CAUSING A FUEL LEAK.
Consequence: FUEL LEAKAGE IN THE PRESENCE OF AN IGNITION SOURCE COULD RESULT IN A FIRE.
Remedy: DEALERS WILL INSPECT TO SEE IF THE LEFT REAR FUEL TANK STRAP MOUNTING BRACKET HAS SPLITTING BEYOND A SPECIFIC LIMIT. VEHICLES
WITH MODERATE TO SEVERE SPLITTING WILL BE REPAIRED USING A REINFORCEMENT CAP, A SPECIAL STRUCTURAL ADHESIVE, AND A RIVET TO REINFORCE THE FUEL TANK MOUNTING BRACKET. THE RECALL BEGAN ON SEPTEMBER 20, 2008. OWNERS MAY CONTACT MITSUBISHI AT 1-800-222-0037.
ELECTRICAL SYSTEM:IGNITION · 08V139000
2008-03-26 · PE08006
MITSUBISHI IS RECALLING 120,000 MY 2004-2006 ENDEAVOR PASSENGER VEHICLES. DURING VEHICLE USE, THE IGNITION KEY INTERLOCK CABLE (WHICH IS A COMPONENT OF THE INTERLOCK SYSTEM) MAY ALLOW THE INTERLOCKING CAM TO FALL FORWARD AND ALLOW THE IGNITION KEY TO BE REMOVED FROM THE IGNITION SWITCH WHEN THE GEARSHIFT MECHANISM IS NOT IN THE PARK POSITION.
Consequence: IF THE DRIVER DOES NOT SHIFT TO PARK BEFORE REMOVING THE KEY AND FAILS TO ENGAGE THE PARKING BRAKE, THE VEHICLE COULD ROLL AND A CRASH COULD OCCUR.
Remedy: DEALERS WILL INSPECT AND CORRECT THESE VEHICLES FOR THE REPORTED CONDITION. THE RECALL WILL BEGIN ON JULY 7, 2008. OWNERS MAY CONTACT MITSUBISHI AT 1-888-648-7820.
SEAT BELTS:FRONT · 08V022000
2008-01-18
ON CERTAIN PASSENGER VEHICLES, THE RIGHT SIDE LOWER SEAT BELT ANCHOR MAY SEPARATE DURING A SEVERE VEHICLE CRASH.
Consequence: BREAKAGE OF THE MOUNTING BRACKET IN A SEVERE CRASH COULD ALLOW THE SEAT BELT TO NOT PROPERLY RESTRAIN THE PASSENGER AND POTENTIALLY RESULT IN INJURY OR DEATH.
Remedy: DEALERS WILL REPLACE THE FRONT PASSENGER SIDE SEAT BELT AND BRACKET ASSEMBLY FREE OF CHARGE. THE RECALL BEGAN ON MARCH 17, 2008. OWNERS MAY CONTACT MITSUBISHI AT 1-800-222-0037.
Building an app?
Free API access to all this data — 50 requests/day, no card required.