1993 DODGE W150

Typical onset: 120,000-180,000 mi

Symptoms: Heavy knocking on cold start or under load, Metal shavings in oil, Low oil pressure at idle, Blue smoke from tailpipe, Excessive blow-by

Fix: These Magnum V8s and the 3.9L V6 are workhorses but neglected oil changes or overheating episodes kill rod and main bearings. Expect a full teardown: new bearings, rings, pistons if scored, honing or boring cylinders. Short block replacement is common if damage is severe. 18-28 labor hours depending on engine size and extent of damage.

Estimated cost: $2,800-5,500

Typical onset: 100,000-150,000 mi

Symptoms: White smoke from exhaust, Coolant loss with no visible leaks, Milky oil on dipstick, Overheating, Rough idle or misfire

Fix: Overheating or age causes head gaskets to blow, often both sides on V8s. Requires removing both heads, resurfacing if warped (common), new gaskets, bolts, and coolant flush. Also address any cracked heads while you're in there. 12-16 labor hours for both heads.

Estimated cost: $1,800-3,200

Typical onset: 80,000-140,000 mi

Symptoms: ATF leaking near radiator, Transmission overheating, Brownish coolant in overflow, Erratic shifting when hot, Milky transmission fluid

Fix: The steel cooler lines rust through or the cooler inside the radiator fails, mixing ATF and coolant (death sentence for both systems). Replace lines, external cooler, flush both systems thoroughly, and replace ATF and coolant. If contamination occurred, expect transmission damage. 4-6 hours for lines/cooler; add 8-12 if trans needs a rebuild.

Estimated cost: $600-1,200 (lines/cooler only); $2,500-3,800 (with trans rebuild)

Typical onset: 70,000-120,000 mi

Symptoms: Clunking when shifting into gear, Excessive vibration at idle in Drive, Transmission 'hopping' on hard acceleration, Visible sagging or torn rubber on mount

Fix: The rubber deteriorates from age, heat, and oil exposure. Replace mount and crossmember bushings while you're under there. Simple job but requires trans support. 2-3 labor hours.

Estimated cost: $250-450

Typical onset: 90,000-150,000 mi

Symptoms: Hard starting, especially when hot, Stumbling or loss of power under load, Stalling at highway speed, Engine surging or hesitation

Fix: Inline filter clogs from tank rust or old fuel; pump on these TBI systems weakens over time. Filter is cheap and easy (1 hour), but pump requires dropping the tank. If pump is original, replace both together. 3-4 hours for pump replacement.

Estimated cost: $150-300 (filter); $500-800 (pump + filter)

Typical onset: 150,000+ mi

Symptoms: Severe knocking from deep in the block, Oil pressure loss despite new bearings, Metal chunks in oil pan, Inability to hold oil pressure even after bearing replacement

Fix: Extreme neglect or spun bearings damage the crank journals beyond standard regrind limits. Requires pulling the engine, removing crank, grinding or replacing it, and reassembling with new bearings. 20-30 labor hours for full engine-out service.

Estimated cost: $3,500-6,000