1995 ASTON MARTIN DB7

Typical onset: 50,000-90,000 mi

Symptoms: Excessive oil consumption (quart per 500-1000 miles), Cold start smoke (blue-grey exhaust), Loss of compression in multiple cylinders, Rough idle when warm, eventual misfire codes

Fix: Complete engine rebuild with Nikasil-to-steel liner conversion or short block replacement. Requires engine removal, 40-60 hours labor. Most shops recommend full rebuild with new pistons, rings, bearings, and gaskets while it's apart. High-sulfur fuel in mid-90s ate the Nikasil coating—pre-2000 engines are prime candidates.

Estimated cost: $12,000-18,000

Typical onset: 60,000-100,000 mi

Symptoms: Grinding or whining noise from supercharger at idle, Loss of boost pressure and power, Rubber coupler dust visible around supercharger, Metal shavings in supercharger oil

Fix: Supercharger removal and rebuild: replace coupler, snout bearings, and reseal. 12-16 hours labor. The rubber coupler deteriorates with age/heat, and input shaft bearings wear. Preventive service every 60-80k miles avoids catastrophic grenading.

Estimated cost: $2,200-3,500

Typical onset: 70,000-120,000 mi

Symptoms: Transmission fluid puddles under front of car, Burnt transmission fluid smell, Harsh or delayed shifts when cold, Low fluid level on dipstick despite no visible external leaks (cooler internal leak into coolant)

Fix: Replace transmission oil cooler and hard lines. The cooler mounts low and corrodes; lines crack at fittings. 6-9 hours labor including fluid flush. If internal leak contaminated coolant, flush cooling system too. ZF 5HP24 transmission doesn't tolerate low fluid.

Estimated cost: $1,200-2,100

Typical onset: 80,000-130,000 mi

Symptoms: Rattling from top front of engine on cold start (first 3-5 seconds), Metallic slapping noise under acceleration, Check engine light with cam/crank correlation codes, Metal debris in oil filter media

Fix: Replace upper tensioner, guides, and chains while accessible. Requires valve cover removal, 14-18 hours labor. These engines have dual chains; upper chain tensioner blade wears and guide rails crack. Catastrophic if chain jumps time—immediate valve/piston contact. Do both chains, all guides, tensioners, and water pump simultaneously.

Estimated cost: $3,800-5,500

Typical onset: 60,000-110,000 mi

Symptoms: Coolant loss with no external leaks, White smoke from exhaust (sweet smell), Rough idle, misfire on adjacent cylinders (typically 2-3 or 4-5), Bubbles in coolant reservoir when running, Hydrocarbon presence in coolant (combustion gas test positive)

Fix: Head gasket replacement both banks (always do both). Engine removal recommended but not mandatory—adds 8 hours. 24-32 hours labor total. Deck surfaces must be checked for warpage. Use updated MLS gaskets, ARP studs recommended. While heads are off, do valve stem seals and timing components.

Estimated cost: $5,500-8,500

Typical onset: 50,000-90,000 mi

Symptoms: Clunking when shifting from Park to Drive/Reverse, Vibration through chassis at idle in gear, Excessive driveline movement visible during throttle application, Shifter vibration at highway speeds

Fix: Replace transmission mount and torque mount. Rubber deteriorates and fluid leaks from hydraulic mounts. 3-5 hours labor. Access requires lifting transmission slightly. Do all three mounts (trans, torque, and rear diff mount) simultaneously—they age together.

Estimated cost: $800-1,400

Typical onset: null

Symptoms: Hesitation or stumble under hard acceleration (boost cuts), Difficulty starting when hot, Fuel pump whine audible from rear seat area, Limp mode activation under load

Fix: Replace in-tank fuel pump and inline fuel filter. Filter clogs from debris and varnish in aging tanks; pumps fail from running hot/dry. 4-6 hours labor (tank drop required). Supercharged engine demands consistent 50+ PSI—weak pump causes lean conditions under boost. Replace filter every 30k miles preventively.

Estimated cost: $900-1,600

Typical onset: null

Symptoms: Power windows drop into door or move slowly, Instrument cluster gauges intermittent or dead, Door locks cycling randomly, Central locking failures (one or more doors)

Fix: Window regulator replacement 2-3 hours per door. Instrument cluster repair requires removal and capacitor replacement or unit exchange (4-6 hours). Door modules fail from moisture intrusion—reseal and replace module. Classic British car electronics gremlins—budget for ongoing electrical repairs. Keep spare window regulators on hand.

Estimated cost: $600-2,200