Buying a used Mercedes-Benz 500SL/SL500 R129 (1988-2001)

Because the striking new R129 500SL sports series took 19 years to replace its R107 predecessor, it generated unrealistic expectations that it would stay fresh for the next two decades.

It later suffered by association with the plain, slab-sided styling of several Mercedes-Benz passenger cars from this period. The revitalized styling and shorter model lives of today’s Mercedes-Benz sports models may have dated the R129 series earlier than previous models but its premium quality makes it outstanding used buying today.

The original 500SL was renamed in 1993 as the SL500 with few changes. This popular V8 series is the best economy/performance compromise between the complexity and high running costs of the SL600 V12 and the tame SL280 six-cylinder version.
 
Prices: Early examples have dropped from a $260,000 new price to a starting range of $50-60,000. Look for a 1993-98 SL500 in the $60-80,000 range with the late 1995 5-speed auto upgrade commanding a premium. The final SL500 specification from August 1998 to mid-2002 with its lighter V8 and styling tweaks spans the $90-150,000 range according to age and condition.

Checkpoints
Major engine improvements in late 1995 boosted fuel economy along with new 5 speed auto. New M113 V8 from August 1998 cut weight with further boost in economy. Top shelf mechanical quality is higher than everyday Mercedes-Benz models but oil change intervals are too long for this level of complexity in city use.

Watch out for private imports that look stunning but can hide serious structural rust in the rear section. Local fuel can cause cat converters on imports to fail for big expense. Use oil company-branded premium fuels only or risk fuel system damage.

Fresh, high quality coolant is essential to avoid premature corrosion and failure of aluminium and composite parts throughout engine, cooling and heating system. Separate electric pump which feeds heater core is an extra failure point.  

Tyre choice can make huge difference to road noise and overall refinement. Check with experts on what works and what doesn’t.

Advanced suspension depends on hydraulics to maintain correct ride height and handling. Plastic reservoir fluid level indicator can snap off then fall into hydraulic system and interfere with hydraulic pumps. Unusual wear of rear inner tyre tread can be the first warning sign of erratic suspension hydraulics. Allow up to $1500 depending on damage.

Gas diaphragms at each wheel vital for adaptive damping function can split and cause the car to bounce uncontrollably. Replacement cost not excessive. 

Computer shuts down hood operation if mechanism is faulty so check that it works. Check condition of hood fabric and seams.

Alloy wheel coating can peel then cost plenty to strip and refinish.

Leather is high quality but requires conditioning at least every six months to keep supple especially with extra exposure to sun. Check for sun damage carefully as classy cabin parts are not cheap.

Check the operation of every accessory, especially those that rely on electric servos or motors.