1975 Mercedes-Benz 450 SL

This particular 450 SL was first registered on 1 April 1975 and is described as having covered 56,000 miles from new. It has had six previous owners and has been in the current ownership since 1986, suggesting nearly four decades of careful custodianship. 

That continuity is notable in an R107, a model often traded multiple times through its life, and helps explain its largely original presentation today.

This example is finished in white with a matching hardtop and contrasting black interior. It retains its factory appearance, with no modifications reported other than the addition of a discreet battery isolator and a detachable wind deflector for open-top use.

The car is accompanied by a current MoT certificate valid until June 2026, a strong indication of careful ownership, bearing in mind that a car of this vintage has no legal requirement for an MoT test. The odometer displays 56,000 miles, a figure that appears consistent with the condition of major components and with the car’s documented service history.

Under the current owner’s long tenure since 1986, the car has been maintained periodically, with major mechanical work carried out as required. Notable items include a cylinder head gasket replacement, suspension bush renewals, and fuel system work. This steady attention suggests a car that has been kept useable and well-preserved rather than left to deteriorate.

Presented as a genuine, usable R107 with known long-term ownership and an appealingly original specification, it represents an opportunity for an enthusiast to take on one of Mercedes-Benz’s most enduring models.

The white finish suits the R107’s proportions and accentuates its subtle design. Chrome bumpers, window trim, and Mexican Hat alloy wheels all appear present and largely intact, maintaining the car’s period-correct appearance.

The paint finish shows age-related wear consistent with a 1970s original car. There are paint cracks to the front nearside wing and similar cracking to areas at the rear, as well as bubbling to the paint behind the headlamp and around the passenger door trim. Surface corrosion is also visible around the front badge, and the hardtop paint is noticeably below the standard of the bodywork.

The boot struts don’t hold. This is a minor but relevant detail for a prospective buyer intending to use the car as intended. 

Both the soft-top and hardtop operations being central to SL ownership - the tool to release the hardtop is in the box with the hoist components.

While some areas of corrosion are beginning to appear, these appear to be largely cosmetic rather than structural at this stage. Addressing them would help preserve the body before deterioration progresses, but the car retains an attractive and authentic patina that many enthusiasts value in unrestored R107s.

The interior continues the theme of originality. Trimmed in black, the cabin features the R107’s well-known blend of luxury and functionality, with clear instrumentation and substantial materials that typify Mercedes-Benz’s build quality of the period.

There are noticeable tears to both cloth seat bases, which will require repair or retrimming to achieve a fully presentable finish. Otherwise, the dashboard, carpets, and door panels appear consistent with the vehicle’s age and mileage, showing wear commensurate with gentle long-term use rather than neglect.

The removable wind deflector supplied with the car enhances comfort during open-top driving and is a desirable accessory for anyone planning to use the SL regularly. The cabin overall presents as original and honest, with scope for sympathetic refurbishment should the next owner wish to elevate its cosmetic condition.

Mechanically, this 450 SL retains its original 4.5-litre V8 engine paired with an automatic transmission. The vendor has supplied a record of major work undertaken over the years, demonstrating consistent maintenance:

• Rear subframe bushes replaced, April 2022
• Injector and fuel hoses replaced, April 2021
• Exhaust replaced, April 2016
• Water pump and thermostat replaced, April 2012
• Fuel pump replaced, November 2007
• Cylinder head gasket and head repair, November 2004
• Front and rear subframe mountings replaced, May 1996
• Front and rear brake calipers replaced, May 1996

This pattern of work suggests long-term investment in keeping the mechanical elements sound, with key components renewed as required. While the car is running and MOT’d, a prospective purchaser should perform routine checks or a professional inspection to confirm operational status and ensure continued reliability, as expected with any classic car.

The vehicle is accompanied by a valid MoT certificate to June 2026 and, based on the documentation, a record of historic MOT certificates charting mileage progression over time. The invoices referenced above cover notable maintenance over nearly three decades, reflecting responsible long-term ownership.

Registered on 1 April 1975, this example shows six previous owners and continuous custodianship by the current keeper since 1986. The car’s longevity under one owner, together with its modest mileage and ongoing maintenance history, provide a reassuring background.

Although no full tool kit is present, the vehicle benefits from practical additions including a battery isolator and detachable wind deflector. The owner says a Mercedes hard top ceiling hoist is also included in the sale, although new ceiling fixings will be required. She says:

‘I purchased the car as it looks stunning especially with the hood down and has always attracted attention. I am regrettably selling the car as in recent years it has been used very infrequently so it is now time for someone else to enjoy it although it is 50 years old.

‘I have owned the car for 39 years and it has always been garaged and covered. It is largely original as in the past 39 years only essential works have been carried out. The seat squabs will require re-covering.

‘In 2020 the offside front wing and driver’s door were resprayed following a minor scrape. The work (Insurance claim) was carried out by Lemass Automotive.

‘The only faults I am aware of are the two noted on the last MoT [a minor exhaust leak and slight seepage from a power steering hose]. I believe the engine is the original.’

As presented the documentation supports an honest and well-preserved 450 SL with a traceable record of upkeep — a solid foundation for further preservation or sympathetic improvement.

The Mercedes-Benz 450 SL remains one of the most appealing all-rounders of its era — a car equally suited to relaxed touring or weekend use. This example’s combination of long-term ownership, moderate mileage and steady mechanical care makes it a strong candidate for enjoyment as-is or for gentle cosmetic restoration to bring it to the next level. It represents a usable and authentic slice of 1970s Mercedes-Benz history.

We are happy to offer this car for auction with an estimate in the range of £12,000 - £15,000.

Viewing is strongly encouraged, and this lot is located at Bonhams|Cars Online HQ. Viewings are STRICTLY BY APPOINTMENT and we are open weekdays between 10am - 12pm or 2pm - 4pm. To make a booking, please use the ‘Enquire About This Vehicle’ button on the listing. Feel free to ask any questions, or try our ‘Frequently Asked Questions’.