1990 TOYOTA SUPRA

Typical onset: 60,000-120,000 mi

Symptoms: White smoke from exhaust on cold start, Milky oil or chocolate milk appearance on dipstick, Overheating or coolant loss with no visible leaks, Rough idle and misfires

Fix: Factory torque spec was inadequate; requires head removal, resurfacing (often warped), ARP head studs, and MHG (multi-layer metal gasket). Many owners do full rebuild while head is off. 15-25 labor hours depending on condition and preventive work done simultaneously.

Estimated cost: $2,500-5,000

Typical onset: 80,000-150,000 mi

Symptoms: Loud knocking noise from lower engine that increases with RPM, Sudden loss of oil pressure, Metal shavings in oil or on magnetic drain plug, Catastrophic failure can occur without warning if oil changes neglected

Fix: Usually result of oil starvation, deferred maintenance, or failed head gasket contaminating oil. Requires complete teardown, crank polishing or replacement, all new bearings, and typically short block replacement if journals are damaged. 25-35 hours labor.

Estimated cost: $4,000-8,000

Typical onset: 100,000-180,000 mi

Symptoms: Transmission fluid leaking near radiator, Fluid puddles under front of car, Transmission slipping or delayed engagement if fluid level drops, Pink milkshake in coolant reservoir if cooler fails internally

Fix: Hard lines rust through or cooler inside radiator fails, mixing ATF and coolant (both fluids ruined). External line replacement is 2-3 hours; internal cooler failure requires radiator replacement, complete fluid flush of both systems, and sometimes transmission rebuild if contamination was severe. 3-8 hours total.

Estimated cost: $400-2,500

Typical onset: 120,000-200,000 mi

Symptoms: Blue smoke on acceleration from oil burning, High-pitched whine or grinding noise under boost, Loss of power and boost pressure, Excessive oil consumption

Fix: Factory CT26 turbos wear out seals or crack housings, especially if oil changes neglected. Replacement with rebuilt or upgraded unit requires 6-10 hours including associated gaskets, oil feed/return lines inspection, and coolant lines. Many upgrade to larger turbo while in there.

Estimated cost: $1,200-3,000

Typical onset: 80,000-140,000 mi

Symptoms: Hard starting especially when hot, Stumbling or hesitation under load, Stalling at idle after warm-up, Fuel pump whine audible from rear of car

Fix: In-tank pump and inline fuel filter both prone to clogging from tank sediment in aging cars. Filter is 0.5 hours; pump requires tank drop at 3-4 hours. Smart move is replacing both simultaneously and inspecting tank for rust.

Estimated cost: $400-900

Typical onset: 70,000-120,000 mi

Symptoms: Clunking when shifting from Park to Drive or Reverse, Excessive vibration at idle, Visible engine movement when revving in Park, Transmission whine that changes with throttle input

Fix: Rubber deteriorates and mounts collapse, allowing drivetrain to shift excessively. Transmission mount is most critical and accessible at 1.5 hours; full engine mount set is 4-6 hours. Creates driveline vibrations that feel like bigger problems.

Estimated cost: $300-800