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B8 SLX

1988 Mercedes-benz 420

Black Petrol 4196cc
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MOT Status

Valid
Expires2 Oct 2026
Tests17 (14 pass, 3 fail)
Pass rate82.4%

Mileage

123,275 mi
Last recorded123,275 miles
Recorded on3 Oct 2025
Typical for 1988 Mercedes-benz 420101,568 mi

Above average mileage for this year

4 checks still locked for this Mercedes-benz
Stolen
Finance
Write-off
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Vehicle Details

RegistrationB8 SLX
MakeMercedes-benz
Model420
Year1988
ColourBlack
Fuel typePetrol
Engine4,196cc

All premium checks include

50+ data points
Finance Check (Experian) Insurance Write-off Salvage Auction Stolen Check Previous Owners Ex-Taxi, Police, NHS Mileage Anomaly Import / Export Scrapped Check Plate Changes

MOT History

14 pass 3 fail
Pass 3 Oct 2025 123,275 miles
Pass 21 Sep 2024 123,214 miles
Pass 23 Sep 2023 123,085 miles
Pass 8 Sep 2022 123,040 miles

Exhaust emits blue smoke during acceleration (8.2.1.2 (g))

Pass 9 Sep 2021 122,460 miles

Nearside Rear Tyre slightly damaged/cracking or perishing (5.2.3 (d) (ii))

Pass 28 Nov 2016 121,882 miles

Exhaust emits black smoke during acceleration (7.3.A.2c)

Offside Front Brake hose has slight corrosion to ferrules (3.6.B.4e)

Suspension component mounting prescribed area is corroded but not considered excessive nearside front chassis (2.4.A.3)

Suspension component mounting prescribed area is corroded but not considered excessive offside front chassis (2.4.A.3)

Pass 6 Jul 2015 119,631 miles

Exhaust emits blue smoke during acceleration (7.3.A.2c)

Nearside Front Brake hose has slight corrosion to ferrules (3.6.B.4e)

Offside Front Brake hose has slight corrosion to ferrules (3.6.B.4e)

Parking brake: parking brake efficiency only just met. It would appear that the braking system requires adjustment or repair. (3.7.B.7)

Pass 1 Mar 2014 117,051 miles

Exhaust emits blue smoke during acceleration (7.3.A.2c)

Nearside Front Brake hose has slight corrosion to ferrules (3.6.B.4e)

Offside Front Brake hose has slight corrosion to ferrules (3.6.B.4e)

Pass 22 Mar 2013 114,194 miles
Pass 24 Mar 2011 113,310 miles
Fail 22 Mar 2011 113,308 miles

Exhaust has part of the system excessively deteriorated (7.1.1a)

Nearside Headlamp excessively deteriorated so that the light output is severely reduced (1.7.5a)

Offside Headlamp excessively deteriorated so that the light output is severely reduced (1.7.5a)

Windscreen washer provides insufficient washer liquid (8.2.3)

Exhaust emits blue smoke during acceleration (7.3.A.2c)

Pass 3 Apr 2009 110,130 miles

Nearside Front Suspension arm corroded but not seriously weakened (2.4.G.1)

Nearside Rear Anti-roll bar attachment bracket/mounting corroded but its strength is not seriously reduced (2.4.G.1)

Pass 9 Jul 2008 109,584 miles

Oil leak

Rear Exhaust has part of the system slightly deteriorated (7.1.1a)

slight corrosion n/s/r inner wheelarch

slight movement in all front subframe mountings

Fail 16 Jul 2007 106,624 miles

Exhaust has part of the system slightly deteriorated (7.1.1a)

Nearside Front Tyre tread depth below requirements of 1.6mm (4.1.E.1)

Nearside Rear Tyre tread depth below requirements of 1.6mm (4.1.E.1)

Offside Front Tyre tread depth below requirements of 1.6mm (4.1.E.1)

Offside Rear Tyre tread depth below requirements of 1.6mm (4.1.E.1)

Pass 16 Jul 2007 106,624 miles

Exhaust has part of the system slightly deteriorated (7.1.1a)

Pass 1 Feb 2006 99,021 miles

Body has slight corrosion (6.1.B.2)

Rear Anti-roll bar attachment bracket/mounting corroded but its strength is not seriously reduced (2.4.G.1)

both front flexible hose ferrule unions slightly corroded

rear tyres worn centre tread

Fail 24 Jan 2006 99,021 miles

Offside Front Brake master cylinder/servo mounting prescribed area is excessively corroded (3.6.C.3)

Rear Brake hose ferrule excessively corroded (3.6.B.4e)

Body has slight corrosion (6.1.B.2)

Rear Anti-roll bar attachment bracket/mounting corroded but its strength is not seriously reduced (2.4.G.1)

both front flexible hose ferrule unions slightly corroded

rear tyres worn centre tread

How Reliable is the Mercedes-benz 420?

Based on 24,311 MOT tests across 2,343 vehicles.

75.7%
Pass Rate
809
Miles/Year
40
Year Lifespan
2,343
On UK Roads

Top MOT Failure Points

Suspension component mounting prescribed area is excessively corroded 647
Brake pipe excessively corroded 577
Tyre tread depth below requirements of 1.6mm 565
brake binding 530
Windscreen wiper does not clear the windscreen effectively 479
Full Mercedes-benz 420 reliability report

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B8 SLX is a 1988 Mercedes-benz 420 in Black with a 4,196cc petrol engine. This vehicle has been through 17 MOT tests with a personal pass rate of 82.4%.

Across all 1988 Mercedes-benz 420 models, the average MOT pass rate is 75.3% with a typical mileage of 101,568 miles. This particular vehicle has performed better than the average for its year.

The most common reason a Mercedes-benz 420 fails its MOT is suspension component mounting prescribed area is excessively corroded, accounting for 647 recorded failures. If you're considering buying B8 SLX, it's worth having these areas checked by a mechanic before committing.

The Mercedes-benz 420 typically stays on UK roads for around 40 years. At 38 years old, this Mercedes-benz 420 is approaching the upper end of the typical lifespan for this model.

Frequently Asked Questions

How do I check the history of B8 SLX?

You can check the full history of B8 SLX by running a full vehicle check. This shows you finance, stolen, write-off, MOT history, mileage records and more.

What year was B8 SLX registered?

B8 SLX is a 1988 Mercedes-benz 420, first registered on 30 December 1988.

Is B8 SLX safe to buy?

The MOT history for B8 SLX shows 17 tests with a 82.4% pass rate. To check for outstanding finance, stolen markers, write-off history and mileage discrepancies, run a full vehicle check.

Does B8 SLX have outstanding finance?

Finance checks require a premium vehicle report. This checks against all major UK finance providers to see if there is any outstanding finance on B8 SLX. If you buy a car with outstanding finance, the finance company can repossess it.

No warranty or guarantee of accuracy is provided for any free data on this page. The data guarantee applies only to information obtained through the purchase of a full check.