2006 MITSUBISHI MONTERO

Typical onset: 80,000-140,000 mi

Symptoms: Strawberry milkshake fluid (ATF mixed with coolant) in radiator overflow or transmission dipstick, Transmission slipping, delayed engagement, or complete failure, Overheating transmission temperatures, Pink/brown sludge visible in coolant reservoir

Fix: Internal transmission cooler in radiator corrodes and leaks, cross-contaminating coolant and ATF. Requires radiator replacement, full transmission flush (often multiple times), or complete transmission rebuild if caught late. 6-12 hours labor depending on damage severity. If caught early, you might save the transmission with aggressive flushing; if ignored, plan for a rebuild or replacement.

Estimated cost: $800-4,500

Typical onset: 120,000-180,000 mi

Symptoms: Excessive oil consumption (quart every 500-1,000 miles), Blue smoke from exhaust on startup or acceleration, Fouled spark plugs on cylinders 1, 3, or 5 most commonly, Loss of power and rough idle, Low compression on cylinder leak-down test

Fix: The 3.8L SOHC develops worn piston rings and cylinder glazing, especially if oil changes were stretched. Proper fix is engine rebuild with new pistons, rings, honing, and often valve seals. Short-block replacement is sometimes more cost-effective. 20-30 hours labor for in-chassis rebuild, less if pulling engine. Some owners limp along adding oil, but you're risking catalytic converter damage and eventual failure.

Estimated cost: $3,500-6,500

Typical onset: 100,000-160,000 mi

Symptoms: Coolant loss with no visible leaks, White smoke from exhaust, Overheating, especially under load or towing, Bubbles in coolant reservoir when running, Rough idle or misfire codes

Fix: V6 head gaskets can fail from overheating events (often related to that transmission cooler issue) or age. Both heads should be resurfaced, and you're in there 12-16 hours labor minimum. Smart shops pressure-test the block and check for cracks. If you've overheated badly, you may need the full engine rebuild anyway. Replace timing belt, water pump, and all coolant hoses while you're in there.

Estimated cost: $2,800-4,200

Typical onset: 70,000-120,000 mi

Symptoms: Clunk or thud when shifting from Park to Drive or Reverse, Excessive vibration at idle in gear, Visible sagging or separation of rubber mount, Transmission movement visible when revving engine in park

Fix: Rubber transmission mounts deteriorate from heat and age. These trucks are heavy, and off-road use accelerates the wear. Straightforward replacement, but access can be tight. 2-3 hours labor. Replace all mounts if one has failed; the others are likely close behind.

Estimated cost: $300-600

Typical onset: 60,000-100,000 mi

Symptoms: Hard starting, especially when hot, Hesitation or stumbling under acceleration, Loss of power at highway speeds, Engine stalling at idle or when coming to a stop, Check engine light with lean codes

Fix: In-tank fuel filter and sock screen clog from sediment, particularly if the truck sat or saw poor fuel quality. Fuel pump assembly replacement is often needed because filter isn't serviceable separately on many models. 2-3 hours labor to drop tank. Some techs add an inline filter as insurance. If you're doing the pump, replace the fuel pressure regulator and strainer at the same time.

Estimated cost: $400-900

Typical onset: 150,000+ mi

Symptoms: Knocking or tapping noise from lower engine, worse when cold, Metallic rattling that increases with RPM, Low oil pressure warning at idle, Metal shavings or glitter in oil, Sudden catastrophic failure (thrown rod)

Fix: Result of oil neglect, running low on oil (often from that piston ring issue), or using wrong viscosity. Once bearings are knocking, you need a full bottom-end rebuild or short-block replacement. 25+ hours labor if rebuilding in chassis. If a rod lets go, you're looking at a junkyard engine or scrap the truck. Preventable with religious oil changes every 3,000-5,000 miles and immediate attention to oil consumption.

Estimated cost: $4,000-7,000