The 1998 Silver Spur pairs a bulletproof 6.75L V8 with a fragile GM 4L80E transmission and aging hydraulics that demand constant attention. It's a handbuilt luxury barge where routine maintenance costs rival major repairs on ordinary cars.
Transmission Oil Cooler and GM 4L80E Shift Solenoid Failure
Common · high severityTypical onset: 70,000-110,000 mi
Symptoms: Harsh or delayed 2-3 upshift, especially when warm, Transmission slipping under moderate throttle, Contaminated trans fluid from internal cooler leak mixing coolant and ATF, Check engine light with P0758 or similar shift solenoid codes
Fix: External cooler replacement requires 3-4 hours labor; internal leaks mean coolant in the transmission requiring flush and torque converter replacement. Shift solenoid pack replacement requires pan drop and valve body work, 4-6 hours. Many shops replace all solenoids preventively once one fails.
Estimated cost: $1,800-4,200
Hydraulic Brake Accumulator Sphere Failure
Common · high severityTypical onset: 60,000-90,000 mi
Symptoms: Brake pedal goes nearly to floor before engaging, Hydraulic pump runs constantly or cycles every few seconds at idle, Brake warning light illuminated on dash, Spongy or inconsistent pedal feel with pulsing pump noise
Fix: The Citroen-derived hydraulic system uses nitrogen-charged spheres that lose pressure over time. Accumulator replacement is 5-7 hours including system depressurization, brake fluid flush, and nitrogen recharge. Critical safety item—cannot be ignored.
Estimated cost: $2,200-3,800
Self-Leveling Rear Suspension Hydraulic Leaks
Common · medium severityTypical onset: 80,000-120,000 mi
Symptoms: Rear end sits low after overnight parking, rises after starting, Green hydraulic fluid (LHM) pooling under rear axle, Suspension warning light on dash, Uneven ride height side-to-side
Fix: Rear struts and hydraulic lines rot from age and LHM exposure. Strut replacement is 6-8 hours per side including accumulator depressurization. Hard lines rust through at fittings. OEM parts are NLA for many components; aftermarket quality varies wildly.
Estimated cost: $3,500-6,500
Engine Oil Consumption from Worn Piston Rings
Occasional · medium severityTypical onset: 100,000-150,000 mi
Symptoms: Burning 1+ quart per 500-800 miles, Blue smoke on cold start or deceleration, Carbon buildup on spark plugs, Marginal compression readings but engine still runs smoothly
Fix: The 6.75L V8 is nearly indestructible but ring wear is common in high-mileage examples. Full rebuild with pistons and rings is 40-50 hours labor on this engine—removing bodywork and ancillaries is incredibly time-consuming. Many owners just add oil and drive until catastrophic failure.
Estimated cost: $12,000-18,000
Fuel System Deterioration and Filter Clogging
Common · medium severityTypical onset: N/A (age-related)
Symptoms: Hard starting when hot or after sitting, Rough idle and hesitation under light throttle, Stalling at stop lights after highway driving, Fuel smell in cabin or garage
Fix: Twenty-six-year-old fuel lines, rubber hoses, and in-tank sock filter degrade regardless of mileage. In-tank pump access requires tank drop (8-10 hours). Fuel filter changes are cheap but hard to access—should be done annually. Injector o-rings leak externally causing fire risk.
Estimated cost: $1,200-2,800
Front Subframe and Crossmember Corrosion
Occasional · high severityTypical onset: N/A (climate-dependent)
Symptoms: Clunking over bumps from front suspension, Steering wander or vague on-center feel, Visible rust or flaking on subframe mounting points, Failed inspection in rust-belt states
Fix: The aluminum body hides severe steel subframe rot underneath. Once structural integrity is compromised, repair involves full subframe removal (18-24 hours), welding, or replacement with NLA parts. This can total an otherwise decent car.
Estimated cost: $5,000-9,000
Buy only if you have a trusted Rolls specialist nearby, a $10K repair fund, and accept that parts availability is a gamble—this is a restoration project masquerading as transportation.
AI-assisted summary drawn from NHTSA recall data, our labor-times database, and platform knowledge. Not a substitute for a pre-purchase inspection on a specific vehicle.