1990 LAMBORGHINI DIABLO

Typical onset: 40,000-80,000 mi

Symptoms: Knocking or ticking from lower engine block, especially on cold start, Metal shavings in oil during changes, Sudden catastrophic failure leading to rod through block

Fix: Engine-out job requiring complete teardown, bearing replacement, crank inspection/polishing, and often full bottom-end refresh. Budget 60-80 hours labor. Early Diablos had marginal oiling under hard use; many techs replace all rod and main bearings simultaneously to avoid repeat teardown.

Estimated cost: $18,000-35,000

Typical onset: 50,000-90,000 mi

Symptoms: Coolant loss with no visible leaks, White smoke from exhaust on startup, Overheating or erratic temperature readings, Oil contamination with coolant (milky dipstick)

Fix: Engine must come out for proper access to both banks. Head removal, resurfacing, new gaskets, updated hardware. ARP studs recommended over factory bolts. 50-70 hours labor. Almost always do both sides even if only one leaks—second side fails within 10k miles.

Estimated cost: $12,000-22,000

Typical onset: 60,000-100,000 mi

Symptoms: Transmission fluid puddles under car, typically right side, Burnt smell after spirited driving, Harsh or delayed shifts when hot, Low fluid warnings if equipped with sensor

Fix: Cooler lines corrode or develop pinhole leaks; cooler itself can crack from road debris. Requires dropping exhaust and heat shields for access. Replace cooler, all lines, and transmission mounts while you're there. 12-18 hours labor. OEM parts are NLA; aftermarket coolers require custom line fabrication.

Estimated cost: $3,500-6,500

Symptoms: Hesitation or stumbling under hard acceleration, Engine cuts out at high RPM, Difficulty starting when hot, Rough idle that worsens over time

Fix: Early Diablos used in-tank filters that trap varnish from old fuel; external filter often overlooked in service. Tank must be dropped for proper cleaning and pump inspection. Many find corroded fuel pumps and sending units. 8-14 hours labor depending on tank condition. Replace ALL filters, inspect lines for corrosion, test pump pressure.

Estimated cost: $2,200-4,800

Typical onset: 70,000-120,000 mi

Symptoms: Transmission stuck in one gear (usually 2nd or 3rd), Harsh or delayed shifts, especially when cold, Check engine light with transmission codes, Erratic shift points or hunting between gears

Fix: Electronic shift control solenoids fail from heat and age. Requires dropping transmission pan, replacing entire solenoid pack (individual units not sold), new filter, and fluid. 8-12 hours labor. Transmission mounts often worn and should be replaced simultaneously—add 4 hours.

Estimated cost: $3,800-6,200

Typical onset: 80,000-130,000 mi

Symptoms: Heavy blue smoke on deceleration or startup, Excessive oil consumption (>1 qt per 500 miles), Loss of compression and power, Fouled spark plugs, misfires on multiple cylinders

Fix: Early V12s had soft piston ring material; rings wear and allow oil past. Requires full engine rebuild with updated rings, honing, piston inspection. If one cylinder shows wear, all twelve need attention. 80-120 hours labor. Many shops recommend full engine-out refresh including bearings, seals, gaskets, timing components at this point.

Estimated cost: $25,000-45,000