Buyer’s guide: Mercedes-Benz W108/9

| 30 Jul 2024
Classic & Sports Car – Buyer’s guide: Mercedes-Benz W108/9

Why you’d want a Mercedes-Benz W108/9

On the British market, high import duties meant the Mercedes-Benz 250S was a bit baffling at launch.

In its price bracket, its 2.5-litre engine was rather small, and the absence of opulent leather and wood made it appear out of place.

To the discerning buyer, however, the outstanding ride, handling and refinement, spacious cabin and light, modern feel combined with exceptional strength and build quality to make it worth every penny.

In addition to its strength, the Mercedes featured several advanced safety features, including rubber-tipped bumpers, recessed interior doorhandles, rubber knobs on the window winders, burst-proof door locks, a snap-off rear-view mirror and a padded steering-wheel boss.

Immensely hard-wearing MB-Tex vinyl was standard, while the optional leather still looked durable rather than luxurious.

Classic & Sports Car – Buyer’s guide: Mercedes-Benz W108/9

The column-mounted gearchange and umbrella handbrake were not well received – hangovers from the days of bench front seats, not the two front armchairs of the 250S – and on Motorʼs first test the brakes disappointed despite an impressive specification; they were still considered ʻspongy and unprogressiveʼ on the 280.

The automatic transmission was also criticised for jerkiness at high revs: Mercedes persisted with its in-house fluid-coupling auto until the final US-model W108/9s in 1971-ʼ72.

Topping the range of the strong-selling W108 was the W109, with a longer wheelbase and a 3-litre ʻsixʼ (or a V8 from 1968/ʼ69).

Upmarket features included self-levelling air suspension, a walnut dash and electric windows. In 1968 it became Mercedesʼ first Q-car when fitted with the 600ʼs 6.3-litre V8, and 6526 were built.

The W108 was kept fresh by adding the 2.8-litre straight-six in 1967 and the 3.5-litre V8 in 1970, gradually phasing out the 250 along the way. America even got a 4.5-litre V8 in 1971.

With Mercedes-Benz W108/9s now all more than 50 years old, most will have undergone rust repairs: check they have been done properly and look out for signs of past crash damage, such as rippled inner metal and poor panel gaps.

The factory can supply most parts and panels, and even 90% of the chromework, but prices can be high so budget carefully if buying a deteriorated car with a view to restoring it: buying a better one now will likely cost a lot less in the long run.

Images: James Mann


Mercedes-Benz W108/9: what to look for

Classic & Sports Car – Buyer’s guide: Mercedes-Benz W108/9

Trouble spots

Please see above for what to check for before you look at any W108/9 Mercedes-Benz cars for sale.

Classic & Sports Car – Buyer’s guide: Mercedes-Benz W108/9

Engine

Mechanical fuel injection on ‘sixes’ has an ECU that costs £1000 to repair, so ensure it runs well.

The V8s had Jetronic injection with high-pressure fuel lines: check their condition.

Engines are very durable, and service parts are available from Mercedes or the aftermarket.

Watch for signs of overheating (usually a silted-up radiator).

Classic & Sports Car – Buyer’s guide: Mercedes-Benz W108/9
Classic & Sports Car – Buyer’s guide: Mercedes-Benz W108/9

Suspension

Look out for wear in kingpins (few have been as well lubricated as here, top), and rubber bushes for deterioration; check springs, dampers and the steering box, too.

Check rear suspension mounts for rot and suspension for sagging: complex air springs can be refurbished, but many have been replaced by coil-spring units.

Classic & Sports Car – Buyer’s guide: Mercedes-Benz W108/9

Rust and chrome

Check above the headlights on Mercedes-Benz W108/9s for rust and filler – and the lights themselves for condition.

Brightwork is extremely expensive, so good chrome is a bonus.

Classic & Sports Car – Buyer’s guide: Mercedes-Benz W108/9

Interior

Hard-wearing MB-Tex vinyl was fitted to most cars. It lasts better than pricey optional leather.

Badly deteriorated trim on Mercedes-Benz W108/9s will be expensive to restore.


Mercedes-Benz W108/9: before you buy

Classic & Sports Car – Buyer’s guide: Mercedes-Benz W108/9

All the engines last well if regularly serviced. Cam drive is by chain, which is easily replaced when rattly; on V8s, chain stretch can lead to engine damage if neglected.

Carbs wear but are easily serviced; Bosch injection is more costly to fix, but it rarely fails. Renew high-pressure fuel lines with ethanol-compatible hoses.

The four-speed Mercedes automatic gearbox features a fluid coupling rather than a torque convertor and was the popular choice on all models except the 4.5-litre V8s, which bowed to US tastes with a three-speed torque-converter auto.

Most manuals were four-speed and very durable; a five-speed manual was a rare option on six-cylinder cars from 1969.

Those models also came with a floor change, optional on four-speeds. Check the diff doesnʼt clonk loudly between forward and reverse drive.

Classic & Sports Car – Buyer’s guide: Mercedes-Benz W108/9

The W108 rear suspension features an ingenious hydropneumatic compensating spring across the rear axle.

It should automatically pump itself up when driven with a full load in the back – to a constant height, whatever the weight.

A sagging rear suggests it has failed; parts are expensive and conversion to a sprung system is common.

The W109 featured more complex self-levelling air suspension instead, supplied by an engine-driven air pump. Again, make sure it is functioning as it should.

The heater fan is prone to failure and a major task to replace because itʼs buried deep under the dashboard, so ensure that itʼs working – likewise the air conditioning, if fitted.


Mercedes-Benz W108/9 price guide

Restoration/Average/Show

  • 300SEL 6.3: £20,000/40,000/100,000*
  • 300SE: £15,000/32,000/47,000*
  • 300SEL: £10,000/25,000/37,000*
  • 280SE 3.5: £8000/20,000/35,000*
  • 250 & 280: £5000/15,000/30,000*
      

*Prices correct at date of original publication


Mercedes-Benz W108/9 history

1965 Frankfurt launch: 250S (130bhp), 250SE (148bhp), 300SE/SEL (168bhp)

1967 Second series: 280S/SE added (140/158bhp); 300SE dropped; 300SEL now 2.8-litre (168bhp)

1968 280SEL and 300SEL 6.3 added

1969 300SEL 3.5 added: 197bhp V8, Bosch D-Jetronic fuel injection

1970 2.8-litre 300SEL dropped; 280SE/SEL 3.5 added

1971 280SE/280SEL/300SEL 4.5 added (USA-only), with three-speed auto and torque convertor; 280SEL ‘six’ dropped

1972 W108/9 replaced by W116


The owner’s view

Classic & Sports Car – Buyer’s guide: Mercedes-Benz W108/9

“I’ve had this 250 and a 3.5 for a long time,” admits Mercedes-Benz Club W108/9 Register Captain Philip Thain. “They are great driving cars – comfortable, with good vision – although the bodies are a bit rust-prone.

“My Mercedes-Benz passion – I have 10 now – comes from my father, who bought a Fintail new when he was serving in Germany. He kept it to 1985 then gave it to me. I still have it.

“The 250 feels slightly underpowered compared with the 3.5, but it is adequate. I bought it from a club member who’d owned it for more than 40 years and really struggled to sell.

“It’s had paint but little welding. It had a new radiator, water pump and viscous fan two years ago, to cure overheating, and a new alternator.

“They’re not cheap to run, but they do benefit from being used regularly. I’ve had my V8 more than 25 years – with air-con and power steering it was sophisticated for its day.”


Also consider

Classic & Sports Car – Buyer’s guide: Mercedes-Benz W108/9
Classic & Sports Car – Buyer’s guide: Mercedes-Benz W108/9

The BMW E3 (left) and Jaguar XJ6 S1 are alternative buys

BMW E3

Bavaria’s response to Mercedes’ W108 had a new straight-six in 2.5, 2.8 then 3.0 and finally 3.3-litre forms, in a stylish, airy and spacious body. Worthy rivals to the Benz, with rot the biggest issue.

Sold 1968-’77 • No. built 221,991 • Price now £7-30,000*


JAGUAR XJ6 S1

Traditional wood and leather in a stylish new shell with superb refinement and a bargain price: the Jaguar XJ looked like the perfect package, but was cramped and the smaller 2.8 was unreliable.

Sold 1968-’73 • No. built 82,126 • Price now £5-25,000*

*Prices correct at date of original publication


Mercedes-Benz W108/9: the Classic & Sports Car verdict

Classic & Sports Car – Buyer’s guide: Mercedes-Benz W108/9

Get the most complete and unspoiled car you can afford, and be prepared to compromise on specification rather than giving yourself a nightmare restoration that you may never see through to completion.

This applies even more strongly to V8s and W109s: complexity doesn’t come cheap.

A well-maintained example will give exceptionally satisfying service and, while they are not cheap to run, quality replacement parts endure.

 

FOR 

  • Expensive when new, Mercedes-Benz W108/9s are good value now
  • Fine luxury transport with outstanding durability
  • The wide range gives plenty of choice
  • Parts back-up is good

 

AGAINST

  • These cars are thirsty
  • Spares can be scarily expensive, so a below-par purchase can make a substantial hole in your wallet

Mercedes-Benz W108/9 specifications

  • Sold/number built 1965-’73/383,361
  • Construction steel monocoque
  • Engine iron-block, alloy-head, sohc 2496/2778/2966cc ‘six’ or 3499/4520/6332cc V8, S with dual twin-choke Solex carbs, SE with mechanical/electronic Bosch injection
  • Max power 130bhp @ 5400rpm to 247bhp @ 4000rpm
  • Max torque 143lb ft @ 4000rpm to 369lb ft @ 2800rpm
  • Transmission four/five-speed manual or three/four-speed auto, RWD
  • Suspension independent, at front by double wishbones, anti-roll bar rear swing axles, load-compensating air spring (air suspension on W109); coil springs, telescopic dampers f/r
  • Steering power-assisted steering box
  • Brakes discs, vented on 4.5/6.3, with servo
  • Length 16ft 1¼in-16ft 5in (4910-5000mm)
  • Width 5ft 11¾in (1820mm)
  • Height 4ft 8in (1420mm)
  • Wheelbase 9ft ½in-9ft 4¾in (2755-2865mm)
  • Weight 3181-3891lb (1446-1769kg)
  • 0-60mph 12.6-6.5 secs
  • Top speed 106-137mph
  • Mpg 16-21
  • Price new £3395-8115 (280S-6.3, 1970)

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