Buyer’s Guide Mercedes-Benz C107 SLC

Buyer’s Guide Mercedes-Benz C107 SLC

Buyer’s Guide C107 SLC Forgotten Son. The 107-series SLC has been overshadowed by its roadster brother ever since it launched in 1971, but views on the Mercedes coupe have softened in recent years – with prices increasing to match the steadily rising interest Words David Sutherland. Images Terry Oborne.


The Mercedes Benz SLC, built for a decade until October 1981, was the car the classic market overlooked until it was almost too late. While the R107 SL roadster on which the SLC was based has been collectable ever since its production ceased, and hence survives in substantial numbers, the C107 coded coupe became forgotten and unloved once the striking 126-series coupe arrived to replace it. A total of 62,888 SLCs were manufactured, hardly an inconsequential number, yet they are rarely seen, most having been sent to the scrapheap.

Perhaps people felt the SLC, 360mm longer in wheelbase and length than the SL, and with awkward rear window trims (there to disguise the fact that the rear windows could not be fully lowered), lacked the SL’s graceful lines. Values stayed low, which meant that relatively minor problems could spell a one-way trip to the crusher.

But things are now changing. As it has become apparent just how scarce these big pillarless coupes have become, collectors are having second thoughts and prices are rising. They are still to be found for £4,000 to £5,000, which gets you into a rolling project, but the big difference is to be seen at the other end of the market, with prices now closing on R107s.

So now is almost certainly your last chance to pay reasonable money for one of the most expensive and exclusive Mercedes from the 1970s. They are mechanically simple in most respects, immensely durable and there are lots of specialists who know them through and through. Just add bravery.


DESIGN & EVOLUTION

The Paris motor show of October 1971 saw the C107’s debut, six months after the SL roadster had been unveiled. The first model to go on sale, in February 1972, was the 350SLC using a 3.5-litre V8 engine producing 197bhp, this coming to the UK market two months after. In July 1972 the 450SLC was added but sold exclusively in North America until February 1973, its 4.5-litre V8 with US spec emissions equipment producing a paltry 192bhp; when it was launched in mainland Europe, and the UK, output was 222bhp.

Both came with a three-speed automatic transmission as standard, but in some markets the 350 could be ordered with a four-speed manual gearbox. However once the 450 arrived, the 350 was dropped from the UK range, so is a very rare car here. SLCs were set up for comfort, with long coil suspension springs and Mercedes’ usual recirculating ball steering. In 1974, no doubt in response to the ‘oil crisis’ that had gripped the world since the previous year, Mercedes installed its 2.7-litre, DOHC, M110 six-cylinder engine, good for 182bhp, in both the SL and SLC, the latter badged 280SLC. It had a four- rather than three-speed automatic gearbox, and could also be ordered as a four-speed manual, which some were.

The 280SLC was not sold in the UK at that point, therefore the 450SLC was the sole C107 delivered in Britain throughout the 1970s. Between November 1975 and February 1976 all three engines were modified for lower emissions, mechanical Bosch K-Jetronic fuel injection replacing the electronic D-Jetronic, and transistorised ignition replacing the time honoured points set up. The 450SLC’s output dropped slightly to 214bhp.

In September 1977 Mercedes introduced the limited run 450SLC 5.0 (see the ‘Rally car for the road’ section on page 88), and the final C107 development came in 1980 with the introduction of a new model, the 380SLC, its new 3.8-litre, aluminium V8 generating 215bhp. In October 1980 the 280SLC was imported to the UK, its output having dipped in 1976 and then restored in 1978 to its original level. The 450 ceased production in October 1980, while the 280 and 380 continued for a further year.


DRIVING THE C107

This is classic old school Mercedes-Benz. You sit behind a huge steering wheel, facing a dashboard that as well as being almost identical to the R107’s looks solid and functional, and you have the usual springy seats, more likely to be trimmed in velour than leather. The rear seat will take two adults, but space is not generous.

The 4.5 V8 is woofly and relaxed, but the pace is not quick, due in part to the lazy three-speed gearbox. Specialised five-litre cars apart, the late arriving 380SLC is widely reckoned to be the best model, thanks to the M116 engine being more lively, and the four-speed automatic more responsive than the three-speeder. The 2.7-litre in the 280SLC changes the car’s character, as it needs to be revved to shift the car briskly (though the C107 is not significantly heavier than the R107). Handling is failsafe, not at all sporty but well balanced.


WHAT YOU’LL PAY

The days of running, MOT’d C107s going for £1,000 to £2,000 are gone, those either no longer in existence or taken in hand. Nonetheless, few other classic Mercedes models show such a wide price range, seen for sale in classifieds for £5,000 to £6,000 but also at classic specialists for 10 times that, such as the 1975 450SLC with just 18,000 miles photographed here, offered by high end classic sports car specialist Howard Wise in Essex for £49,995. Cars without bodywork or mechanical issues, but not concours, are to be found in the £10,000 to £20,000 range. The sub £10,000 cars are usually offered privately, the top priced cars tending to appear only at classic dealers. However we’ve noticed of late that sellers are increasingly using the various classic auctions.


C107 INSIDE AND OUT

POWERTRAIN

Bruce Greetham, director at Redditch based SL specialist, SL Shop, immediately warns of the problems of pre 1976 cars’ fuel system. “They have the early D-Jetronic injection system which is complicated to fix when it goes wrong,” he says, “and specialist knowledge is needed to understand it.” The rubber pipes tend to perish and leak.

The M117 V8 is reliable and long lasting, although sheer age can now work against it. For example, the exhaust manifold is likely to be rusted solid against the engine’s iron block, turning a straightforward task such as changing the manifold gasket into an engine-out job. This problem does not affect the all aluminium 380SLC M116 engine.

On all M117 engines, you must check the condition of the camshaft chain – a long length of chain that serves both cylinder banks. A rattling noise means it could be about to break with potentially devastating consequences for the cylinder heads and valves. Also check the condition of the camshafts, by removing the oil filler cap and looking in at the state of the cam; if it’s worn, the opposite one is likely to be in the same condition.

From far left: No SLC apart from the 450 5.0/500 can be thought of as truly fast, but plentiful torque makes the V8s great cruisers, the in-line six not quite as effortless; almost all cars are an automatic.


SUSPENSION, STEERING AND BRAKES

There are no particular issues here, but once again age can be the enemy. The suspension and subframe bushes are likely to be worn, which affects handling, making the SLC feel vague at the front. It’s also likely that all of the suspension dampers will be worn and possibly leaking too.

Even when new the C107’s steering lacked much feel, and with wear added vagueness sets it. It may leak too, and to check this you will need to inspect from underneath, as leaks will not be spotted by looking in the engine bay. If the system ‘groans’ when lock is applied, the fluid in the steering reservoir may be too low. For brakes, it’s simply a question of checking for wear, but disc/pad replacement is not expensive at about £300.

The SLC is surprisingly long at 4.75m; rear side window slats a curiosity.


BODYWORK AND WHEELS

If there is a lot of body rust, walk away. “The body must be checked for advanced corrosion in the bulkhead areas, chassis legs, inner and outer sills, boot floor and floorpans and so on,” Bruce warns. “If this is evident on the car, then in most cases it is not worth undertaking repairs unless the car has some sentimental value. You can easily invest well over £60,000 on restoring a C107.”

Early cars came with steel wheels and colour matched hub caps, while later models had ‘Mexican hat’ alloys, all rims 14-inch. If the alloys are in poor condition, a set of four will be easy enough to source for £150 to £200. But if the tyres are worn, budget over £200 for each one – 205/70VR14 is no longer a mainstream size, so you’ll need a specialist classic tyre such as a Pirelli Cinturato.

Silver Green metallic paint would make finding rust easy – if there was any on this 18,000-mile example; 31,739 450SLCs were made by Benz.

The body must be checked for advanced corrosion in the bulkhead areas, chassis legs, inner and outer sills, boot floor and floorpans.


INTERIOR AND ELECTRICS

The interior is another crucial aspect of a C107. Most had a deep pile velour trim, which, unlike leather, does not look better with age. “The early interior fabrics are now hard to find, and the cloth is very expensive,” Bruce comments.

As on most classic cars, a sunroof is more of a curse than an asset. “The sunroof models can suffer with drainage problems front and rear, water leaking all the way down into the sills,” Bruce tells us. He also points out that the engine ECU (electronic control unit) is mounted in the passenger footwell, and if it suffers water ingress as a result of leaks into the cabin, the engine may run poorly.

Clockwise from top left: Owners of R107 SLs would find most of the SLC’s cabin familiar, including its lack of luxury items; basic instrument cluster design includes an oil pressure gauge; longer wheelbase to accommodate extra rear space.


VERDICT

After decades being shunned, during which it almost became extinct, the 107-series SLC has been rehabilitated in the eyes of collectors, and some now even hail it as a nicer car to drive than the R107 roadster. It’s certainly a better prospect if you don’t want the full exposure that a convertible subjects you to.

But affordable as they still can be, ownership of a C107 can never be half-hearted. You must be prepared to spend money maintaining it properly, and the uncomplicated nature of its design is not reflected in running costs, which will be high, at least until you get it sorted to your satisfaction. That said, look after an SLC when you buy it and the car will look after you when you come to sell it.


Rally car for the road

The 450SLC 5.0, introduced at the Frankfurt motor show in 1977 amounted to Mercedes’ first ‘homologation special’. With its five-litre, all aluminium V8 40kg lighter than the 4.5, and producing 237bhp/296lb ft, and a further 80kg shed through use of aluminium for the bonnet, bootlid and bumpers, and special lightweight wheels, this was the car Stuttgart entered in the World Rally Championship from 1978 to 1980. Badge apart, you can tell it from a regular C107 by the small black plastic wing on the bootlid, and the grey finish on the lower side bodywork. Furthermore, the seats are set slightly lower.

It received a four-speed automatic gearbox and slightly modified engine for 1980, though output remained the same, and was rebadged the 500SLC. Road trim production of both models totalled 2,769, and all came in left-hand drive. Even in their rallying days the cars lacked a high profile, and have never been celebrated in the way some homologation cars have (for example the 1990 190E 2.5-16 Evolution II), hence their values remain relatively modest. That said, good ones that do come up for sale will probably be £40,000 plus.


Typical basic servicing costs (A/B services including VAT)

MODEL 380/450SLC

ANNUAL LUBRICATION SERVICE £250

MAJOR SERVICE 380/450SLC £475


Recalls and non routine servicing costs

 Gearbox service £290

 Replace timing chain and tensioner £1,430

 Front brake pads and brake discs £290

 Replace front subframe bushes £600

 Engine mounts £440

 Shock absorbers, front/rear £510/£535

 Four Pirelli Cinturato tyres £950

*Parts and servicing prices from SL Shop; tyre price from Longstone Tyres


Buyer’s checks

Rust is likely to be found ahead of the windscreen, on the floor, chassis legs, wings and doors

Check rear windows slats are solid, as paint peels

A rattling sound from the engine is a warning that a new engine cam chain is needed

Early cars have electronic D-Jetronic injection, which is temperamental, and leaks

Checking the steering box is not leaking – this must be done from underneath the car

Worn suspension bushes will cause sloppy handling and can cause creaking sounds

Velour interior trim has its own special appeal but does not age well and is tricky to replace


What you’ll pay

£4,000-£6,000 280, 380 and 450SLC, running but in need of serious body and mechanical work

£6,000-£10,000 Compete, trouble free cars, but still a little rough around the edges

£10,000-£20,000 Investment grade SLCs start at this price, should be free of body corrosion

£20,000-£30,000 Above average condition inside and out, and the minimum for a 450SLC 5.0/500SLC

£30,000-£40,000 original condition body and interior, genuine sub 50,000 miles and full history

£40,000-£50,000 Only ‘time warp’ C107s make this sort of money. Must have sub 20,000 miles and as new interior and mechanicals.


Thank you to Howard Wise in Essex for the loan of the 450SLC Tel 020 8418 9191 Web www.howardwisecars.co.ukand to SL Shop in Worcestershire for technical advice, and parts and servicing prices Tel 01386 791072 Web www.theslshop.com


THE BACK END SPOTTED FOR SALE

CLASSIC SPORTS CAR DEALER 450SLC 1989, Australian import, Champagne silver, tan leather, 93,500 miles, £15,990, Surrey

CLASSIC CAR DEALER 350SLC 1971, LHD, metallic grey, red leather, 131,000 km (81,000 miles), £15,000, London

SPOTTED FOR SALE PRIVATE SELLER 450SLC 1979, brown, tan velour interior, 96,000 miles, £8,350, Cheshire


JUST THE FACTS Mercedes-Benz SLC C107

280SLC C107380SLC C107450SLC C107450SLC 5.0 / 500SLC C107

ENGINE M110 2,746cc 6-cyl

POWER 182bhp @ 5,800rpm

TORQUE 177lb ft @ 4,500rpm

TRANSMISSION 4-speed auto, RWD

WEIGHT 1,550kg

0-62MPH 11.0sec

TOP SPEED 121mph

FUEL CONSUMPTION 22.6mpg

YEARS PRODUCED 1974-1981

ENGINE M116 3,818cc V8

POWER 215bhp @ 5,500rpm

TORQUE 221lb ft @ 4,000rpm

TRANSMISSION 4-speed auto, RWD

WEIGHT 1,560kg

0-62MPH 9.0sec

TOP SPEED 134mph

FUEL CONSUMPTION 14.9mpg

YEARS PRODUCED 1980-1981 

ENGINE M116 3,818cc V8

POWER 214bhp @ 5,000rpm

TORQUE 265lb ft @ 4,000rpm

TRANSMISSION 3-speed auto, RWD

WEIGHT 1,630kg

0-62MPH 9.3sec

TOP SPEED 130mph

FUEL CONSUMPTION 19.5mpg

YEARS PRODUCED 1972-1980 

ENGINE M117 4,973cc V8

POWER 237bhp @ 5,000rpm

TORQUE 297lb ft @ 3,200rpm

TRANSMISSION 3-speed auto, RWD

WEIGHT 1,515kg

0-62MPH 8.5/7.8sec

TOP SPEED 140mph

FUEL CONSUMPTION 13.6mpg

YEARS PRODUCED 1978-1980/1980-1981

Figures for an April 1978-on 280SLC (cars built until February 1976 had 182bhp/176lb ft, and from then until April 1978 175bhp/172lb ft), and a 1975 450SLC as pictured (this model produced 222bhp/278lb ft until November 1975); fuel consumption for the 280SLC, 450SLC and 450SLC 5.0/500SLC determined at ¾ of top speed (not more than 110 km/h, 68mph) plus 10 per cent, and for the 380SLC according to EEC urban


They are mechanically simple in most respects, and immensely durable.



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