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AAD 775S

1978 Triumph Stag Auto

White Petrol 2997cc
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MOT Status

Valid
Expires10 Aug 2026
Tests22 (13 pass, 9 fail)
Pass rate59.1%

Mileage

73,716 mi
Last recorded73,716 miles
Recorded on25 Jun 2026
Typical for 1978 Triumph Stag Auto56,939 mi

Above average mileage for this year

4 checks still locked for this Triumph
Stolen
Finance
Write-off
Keepers
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Vehicle Details

RegistrationAAD 775S
MakeTriumph
ModelStag Auto
Year1978
ColourWhite
Fuel typePetrol
Engine2,997cc

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

13 pass 9 fail
Fail 25 Jun 2026 73,716 miles

Offside Headlamp aim projected beam image is obviously incorrect (4.1.2 (c))

Oil leaking excessively from engine (8.4.1 (a) (i))

Pass 11 Aug 2025 71,377 miles

Oil leak, but not excessive (8.4.1 (a) (i))

Power steering component has slight seepage from a component (2.1.5 (a))

Pass 13 Sep 2023 68,880 miles

Oil leak, but not excessive (8.4.1 (a) (i))

Fail 7 Sep 2023 68,787 miles

Exhaust emissions carbon monoxide content excessive (8.2.1.2 (b))

Oil leak, but not excessive (8.4.1 (a) (i))

Pass 30 Aug 2022 68,277 miles
Pass 15 Jul 2017 67,395 miles
Fail 14 Jul 2017 67,380 miles

Windscreen washer provides insufficient washer liquid (8.2.3)

Pass 29 Oct 2016 67,128 miles
Fail 29 Oct 2016 67,128 miles

Offside Side repeater not working (1.4.A.2c)

Pass 11 May 2015 66,961 miles

Oil leak

Fail 11 May 2015 66,954 miles

Nearside Rear Braking system leaking (3.6.A.1)

Oil leak

Pass 19 May 2014 66,727 miles

slight play front wheel bearings

Pass 15 May 2013 66,417 miles

Nearside Front wheel bearing has slight play (2.5.A.3c)

Offside Front Front wheel bearing has slight play (2.5.A.3c)

Fail 15 May 2013 66,417 miles

Battery insecure (1.9.1)

Nearside Front wheel bearing has slight play (2.5.A.3c)

Offside Front Front wheel bearing has slight play (2.5.A.3c)

Pass 25 May 2012 66,288 miles

Offside Front Lower Suspension arm ball joint dust cover deteriorated, but preventing the ingress of dirt (2.4.G.2)

Oil leak

battery is insecure

small split in nearside wiper blade

Fail 22 May 2012 66,281 miles

Offside Front Lower Suspension arm has excessive play in a pin/bush (2.4.G.2)

Coolant leak

Nearside Front Lower Suspension arm has slight play in a pin/bush (2.4.G.2)

Offside Front Lower Suspension arm ball joint dust cover deteriorated, but preventing the ingress of dirt (2.4.G.2)

Oil leak

battery is insecure

slight bind on nearside rear brake

small split in nearside wiper blade

Pass 24 May 2011 65,830 miles

Nearside Front Lower Suspension arm rubber bush deteriorated but not resulting in excessive movement (2.4.G.2)

Offside Front Lower Suspension arm rubber bush deteriorated but not resulting in excessive movement (2.4.G.2)

front tyres and offside rear tyre cracking

Pass 24 May 2010 65,454 miles
Fail 21 May 2010 65,452 miles

All position lamps not working (1.1.A.3b)

Nearside Headlamp not working on dipped beam (1.7.5a)

Nearside Headlamp not working on main beam (1.7.5a)

Offside Headlamp not working on dipped beam (1.7.5a)

Offside Headlamp not working on main beam (1.7.5a)

Rear Registration plate lamp not working (1.1.5c)

Pass 25 Sep 2008 65,448 miles

some cracking in both front tyre outer walls

Pass 8 Sep 2007 65,442 miles
Fail 6 Sep 2007 65,441 miles

Nearside Front Seat belt retracting mechanism defective (5.2.5b)

Offside Front Seat belt retracting mechanism defective (5.2.5b)

How Reliable is the Triumph Stag Auto?

Based on 21,225 MOT tests across 2,079 vehicles.

76.9%
Pass Rate
397
Miles/Year
55
Year Lifespan
2,079
On UK Roads

Top MOT Failure Points

Windscreen washer provides insufficient washer liquid 740
Parking brake: efficiency below requirements 550
Suspension component mounting prescribed area is excessively corroded 491
brake binding 442
Exhaust emissions carbon monoxide content excessive 440
Full Triumph Stag Auto reliability report

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AAD 775S is a 1978 Triumph Stag Auto in White with a 2,997cc petrol engine. This vehicle has been through 22 MOT tests with a personal pass rate of 59.1%.

Across all 1978 Triumph Stag Auto models, the average MOT pass rate is 76.2% with a typical mileage of 56,939 miles. This particular vehicle has a lower pass rate than the average for its year, which may indicate maintenance issues worth investigating.

The most common reason a Triumph Stag Auto fails its MOT is windscreen washer provides insufficient washer liquid, accounting for 740 recorded failures. If you're considering buying AAD 775S, it's worth having these areas checked by a mechanic before committing.

The Triumph Stag Auto typically stays on UK roads for around 55 years. At 48 years old, this Triumph Stag Auto is approaching the upper end of the typical lifespan for this model.

Frequently Asked Questions

How do I check the history of AAD 775S?

You can check the full history of AAD 775S by running a full vehicle check. This shows you finance, stolen, write-off, MOT history, mileage records and more.

What year was AAD 775S registered?

AAD 775S is a 1978 Triumph Stag Auto, first registered on 4 January 1978.

Is AAD 775S safe to buy?

The MOT history for AAD 775S shows 22 tests with a 59.1% pass rate. To check for outstanding finance, stolen markers, write-off history and mileage discrepancies, run a full vehicle check.

Does AAD 775S 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 AAD 775S. 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.