The danger with buyer’s guides such as this is that problems get blown out of proportion – but not on this occasion. In the interests of research, I risked being confronted by an angry owner to check the front wings of his 'immaculate' SLK. There it was: rust bubbling at the bottom rear corners of each front wheel arch.
So why spend money and time on the model? Because the Mk1 SLK, codenamed R170, is, with its electric folding roof, still a stylish car and a wonderful tool for browsing the back lanes, as long as you don’t mind pulling over to allow a sportier BMW Z3 or Porsche Boxster of the same era to zip past. And huge numbers of used examples mean there’s no excuse for not actually finding a good one.
Standard kit included ABS, alloys and traction control. A facelift in 2000 included new front and rear bumpers and body-coloured side skirts (pre-facelift models have unattractive black sills).
A future classic? That’ll be a cherished, rust-free, low-mileage one, for which you should pay around £8000. Prices for the rest start at £1500. Classics they are not – unless you spend a considerable sum on overhauling and rust-proofing. Mileages are high at these prices, which says much about the car’s usability and the tightness of that Varioroof (it should open or close in about 25sec).
The supercharged and V6 engines are strong and powerful, which makes up for the car’s slightly wooden chassis. A full history is common, but most cars dropped out of the franchised and specialist dealer network long ago, so problems can be lurking. These include the electronics (water leaks wreak havoc in the boot) and automatic gearbox and ignition systems, where oil can make its way along wires to control systems. A specialist will know these problems and save you pounds on wasted diagnosis time and new parts.
An expert’s view...
TONY LEACH, MERCEDES-BENZ CLUB
“I’m the club’s specialist on the SLK and have owned three: a 1996 2.3 Kompressor, a 2000 2.0 K and my present car, a ’99 2.3 K, which I have rebuilt to the tune of £8000. The ride is firm and you notice bumps but it’s fun to drive, even at 176,000 miles.
“I love the looks of the first-generation SLK, and the electric folding roof is so convenient. It still looks the part: Mercedes called it a mini-SL at launch. You can get them for £800 but it’s not a car you should buy on the cheap.”
Mercedes SLK problems
Post-facelift cars suffer engine oil contamination of the solenoid that switches the ignition from advance to retard. There’s an official fix, or you can replace the solenoid. A supercharger whine might be a failure.
Auto ’boxes like oil and filter changes every 35k miles. Pilot bushing where computer cable enters gearbox can weep oil into cabling and the computer.
C-Class underpinnings are tough, but front ball joints are prone to failure.
Check for rusty wheel arches and wings where they meet the body (OE wings are £200). Check behind the front indicator lenses for rust. Check panel gaps. Water leaking into boot can cripple the central locking pump.
Indicator problems may be a dirty bulb holder or issues with the CCM (multi-function module for the roof, wipers etc). Next to the battery is a box holding the CCM, engine ECU and the K40 fuse, which suffers intermittent solder failure, disconnecting the ECU and stopping the engine. If engine light doesn’t come on at ignition key position II, check stored fault codes.
If Vario Roof is unused, microswitches can seize. The pump in the boot needs regular fluid changes.
Plastics are coated with a rubberised finish that flakes away, especially near the handbrake. Check air circulation flap works as the fan turns on and off.
Also worth knowing...
Krytox synthetic grease can sort the roof’s squeaky rubber seals. Simply smear it on and — hey presto! — a squeak-free roof.
Mercedes SLK prices
Early cars to 2003, mainly 2.3 Ks and facelifted 2.0 Ks but also some 3.2s, most with more than 120,000 miles.
Mileages around the 80k mark. Some surprises, including a 97R 2.3 K with 33,000 miles and FSH for £2499, albeit in headache yellow.
Mainly 2002-on cars with mileages around 50-80k, including a 2002/52 dealer-sale 200 K with 68k, FSH and one owner for £3500.
Late-2004 cars with high-ish mileages; mid-mileage cars closer to £5000.
The best Mk1 cars, but for this money the Mk2 (R171) becomes available.