Should I check the MOT history before buying a 1999 Cadillac Seville Sts V8 Auto?

Yes. Look for recurring advisories — slow-building issues like corrosion or brake wear patterns show up years before they become failures. A full MOT history analysis will highlight patterns that a single test result won't reveal.

What corrosion should I look for when inspecting a 1999 Cadillac Seville Sts V8 Auto?

Check brake pipes, sills, subframes, and chassis legs. Surface rust is normal at this age; structural rust is a serious problem that is expensive to fix and can fail an MOT.

How are tyres and brakes typically on a 1999 Cadillac Seville Sts V8 Auto?

Tyres and brakes are the most common advisory items on vehicles of this age. Budget for replacement if they are near the limit, and factor this into your offer price.

Is the 1999 Cadillac Seville Sts V8 Auto reliable?

Based on MOT data from 137 vehicles, the 1999 Cadillac Seville Sts V8 Auto has a first-time MOT pass rate of 80%, indicating generally reliable for its class. Always check the full MOT history of any specific vehicle before buying.

Do I need an HPI check when buying a 1999 Cadillac Seville Sts V8 Auto?

Yes. The MOT history will not show outstanding finance, insurance write-offs, or stolen status. An HPI check covers these areas and should be part of any used car purchase.

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Cadillac Seville Sts V8 Auto (1999)

137 real MOT outcomes analysed • 80% first-time pass rate

1999 Cadillac Seville Sts V8 Auto

CarHunch analysed 137 real MOT records for the 1999 Cadillac Seville Sts V8 Auto. Real test outcomes — pass rates, defect profiles, mileage data — from verified DVLA records. Updated as new MOTs are recorded.
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AI Analysis Reliability Overview Check a Specific Reg Buyer's Checklist Pass Rate by Fuel Mileage Distribution Still on the Road MOT Averages Compare Models

This 1999 Cadillac Seville STS falls short of the UK average with a 73.6% first-time MOT pass rate compared to 80%, and nearly one in five examples have recorded a dangerous defect at some point—a genuine concern for a 25-year-old American saloon. The petrol engine's 73.2% pass rate confirms this isn't a reliability standout, and you should expect roughly two failures and nearly 13 advisories per test cycle.

With a median mileage around 78,000 for a vehicle this age, these survivors are relatively low-mileage, yet they're still racking up frequent advisory issues—typically suspension wear, fluid leaks, and electrical gremlins common to ageing V8 automatics. Before committing to one, budget for a pre-purchase inspection by someone familiar with American luxury cars, and factor in that you're buying into a pattern of recurring minor problems rather than a fundamentally sound classic.

We have limited data for the 1999 Cadillac Seville Sts V8 Auto — treat the figures below as indicative rather than definitive.

⚠️ Around 1 in 8 of these vehicles have had a dangerous MOT failure at some point — usually tyres or brakes, and often a one-off issue rather than a persistent problem. The group stats won't tell you which one you're looking at.

First-time pass

80%

UK average ~80%

Around average

Dangerous (ever)

19.7%

At least once in MOT history

Check this vehicle

Avg failures / car

2.12

Over 10.2 tests on record

High

Typical mileage

78k

Middle half: 56k–101k

For context

These stats describe 137 vehicles as a group. The specific vehicle you're looking at could be the one good example or the one outlier. Run its registration to find out.

Average reliability — agree?

See this vehicle's full MOT history & AI hunches

Spot recurring advisories, hidden issues, and how it compares to 137 Cadillac Seville Sts V8 Auto cars.

Before you buy a 1999 Cadillac Seville Sts V8 Auto

Based on MOT data from 137 vehicles — here's what to check.

📋 Check the full MOT history. 19.7% of these vehicles have had a dangerous defect recorded - recurring advisories often signal problems years before they become failures.
Search the reg on CarHunch for the full MOT history, reliability stats and a free AI-powered analysis of that exact vehicle.
🔍 Brake pipes, sills and subframes are the key areas on a vehicle this age — structural rust is hard to spot without getting underneath. A mechanic will check all of this before you commit, and give you a concrete basis to negotiate on price. Inspection →
📄 Outstanding finance, insurance write-offs and clocking won't appear in the MOT records — a dedicated history check covers all of this. Our link gets you 20% off automatically. History Get 20% off via CarHunch

Pass Rate by Fuel Type

Fuel type	Vehicles	Pass rate	Avg failures
Petrol (97%)	133	79.8%	2.14

Mileage Distribution

Most 1999 Cadillac Seville Sts V8 Auto vehicles sit in the blue band. If the vehicle you're looking at is outside it, it's either unusually low or high mileage for its age.

78,320

typical

55,860

low mileage

100,854

high mileage

Half of all 1999 Cadillac Seville Sts V8 Auto vehicles fall between 55,860 and 100,854 miles.

Is the mileage you're seeing normal?

✓ Under 55,860 miles — lower than most. Could be great, or could be a vehicle that rarely moved. Check test frequency and mileage progression in the MOT history.

✓ 55,860–100,854 miles — normal for age. This is where most 1999 Cadillac Seville Sts V8 Autos sit.

⚠ Over 136,152 miles — higher than typical. Not necessarily a problem, but check service history and look out for advisory build-up on tyres and brakes.

1999 Cadillac Seville Sts V8 Auto — Still on the Road

Numbers are thinning — 28% of 1999 Cadillac Seville Sts V8 Autos are still active.

Numbers are declining — 15 vehicles still getting MOTs in 2025 (28% of peak).

Based on vehicles from this manufacture year that had at least one MOT test in each calendar year. Data from 2014–2025.
* The 2020 dip reflects the government's COVID-19 MOT exemption, which allowed certificates to be extended by six months — fewer tests were conducted that year.

MOT History Averages

10.2

Avg MOT tests per vehicle

2.12

Avg failures per vehicle

12.8

Avg advisories per vehicle

Other model years — Cadillac Seville Sts V8 Auto: All Seville Sts V8 Auto years → Which year to buy? →

2001

Or browse all models: Cadillac →

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Average reliability — agree?