Northstar V8 Engines
from £3,300 to £6,000
Rebuilt units from £3,300 · Common codes: L37, LD8
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Cadillac Seville Engine Replacement - Compare Quotes from UK Specialists
Get quotes from trusted UK Cadillac Seville engine specialists. Compare reconditioned and rebuilt prices for L37 and LD8 - 4.6L Northstar V8 covered. Get specialist quotes for your Seville.
Supply & Fit Available
12-Month Warranty
Nationwide Delivery
100+ Suppliers
Pre-Northstar V8 Engines
from £2,600 to £4,000
Rebuilt units from £2,600 · Common codes: HT-4100, 4.5L, 4.9L
Diesel V8 Engines
from £2,000 to £4,500
Rebuilt units from £2,000 · Common codes: LF9
Instant engine replacement quote - 100% free, no obligation
Engine replacement near me - UK-wide specialist network
Compare reconditioned, rebuilt & used engine prices
Supply & fit available - parts and labour from vetted specialistsInstant engine replacement quote - 100% free, no obligationEngine replacement near me - UK-wide specialist networkCompare reconditioned, rebuilt & used engine pricesSupply & fit available - parts and labour from vetted specialistsHow It Works
3 Simple Steps3 Simple Stepsto Finding the Best Cadillac Seville Replacement Engineto Finding the Best Cadillac Seville Replacement Engine
12-Month Warranty
Supply & Fit Available
Nationwide Delivery
Trusted UK Suppliers
Most replacements completed within 3-5 days.
Live UK Engine Market Data
Average Market Prices
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↻ Last updated: 4 Aug 26, 9:26
Customer Reviews
Trusted by Cadillac Seville Owners Across the UK
Rated 4.8 out of 5 by 1,081 verified customers who sourced reconditioned and used Cadillac Seville engines through EngineMarket.
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“Thanks to EngineMarket, I saved over £1,200 on my engine replacement and got matched with a great local specialist within the hour.”
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Variants We Cover
Cadillac Seville Engine ReplacementAll Variants Covered
Cadillac Seville STS
L37 4.6L Petrol
Rebuilt Engines: £3,500-£6,000
Cadillac Seville SLS
LD8 4.6L Petrol
Rebuilt Engines: £3,300-£4,800
Cadillac Seville Elegante
4.5L 4.9L Petrol
Rebuilt Engines: £2,600-£4,000
Cadillac Seville Base
HT-4100 4.1L Petrol
Rebuilt Engines: £2,600-£3,600
Cadillac Seville 4.9L V8
L26 4.9L Petrol
Rebuilt Engines: £3,000-£4,000
Cadillac Seville Diesel
LF9 5.7L Diesel
Rebuilt Engines: £2,000-£4,500
Cadillac Seville 1975-1979
425ci 6.6L Petrol
Rebuilt Engines: £4,500-£6,000
Cadillac Seville 1980-1985
350ci 5.7L Petrol
Rebuilt Engines: £3,000-£4,200
Cadillac Seville Touring Sedan
L37/LD8 4.6L Petrol
Rebuilt Engines: £3,300-£6,000
Cadillac Seville Luxury Sedan
LD8 4.6L Petrol
Rebuilt Engines: £3,300-£4,800
Cadillac Seville 1992-1997
4.9L/L37 Petrol
Rebuilt Engines: £3,000-£5,500
Cadillac Seville 1998-2004
L37
Rebuilt Engines: £3,300-£6,000
Not sure which variant your Cadillac Seville is- Enter your registration number above - we'll identify the exact sub-model, engine code and compatible replacement options instantly.
Seville
Engine Codes
Cadillac Seville Engine CodesFull Technical Specifications & Replacement Guide
Every engine code fitted to the Cadillac Seville across all generations, with technical specs, compatible variants and trims, known failure points, and average rebuilt prices from UK specialists. Select any engine code to compare quotes.
Petrol Engines
Extracted from detailed petrol and performance engine families across Cadillac Seville variants.
L37 - 4.6L Petrol
Main replacement demand comes from timing-chain, cooling-system and performance thermal-management faults.
Compatible variants
STS (1993-2004)SLS (high-output option1994-2004)
Avg. rebuilt price
£3,500 - £6,000
Supply only
Technical specifications
- Fuel type
- Petrol
- Engine size
- 4.6L
- Power output
- 295-300 hp
- Years fitted
- 1993-2004
Common failures
- ●Main replacement demand comes from timing-chain, cooling-system and performance thermal-management faults.
- ●Confirm exact engine code and fitment before ordering.
- ●Ask for warranty and supply & fit terms.
Not sure which engine code?
Can't find your engine code- Enter your registration number above - we'll instantly identify the exact unit, its technical specifications, and live replacement prices from UK Cadillac Seville engine specialists. Every rebuilt engine comes with a minimum 12-month unlimited mileage warranty.
Seville
Common Problems
Cadillac Seville Engine Problems - What It Costs to Fix & When Replacement Makes Sense
The Cadillac Seville's engine reliability varies significantly by generation, with Northstar V8 head gasket failure dominating replacement enquiries for 1993-2004 models, while HT-4100 block porosity affects earlier Sevilles. Every rebuilt engine supplied through EngineMarket includes upgraded internal components designed to address the original failure...
Northstar Head Gasket Failure - Why Seville STS/SLS Engines Fail Prematurely
Northstar Head Gasket Failure
Most affected vehicles
Cadillac Seville STSSLS (1993-2004
Cadillac Seville STS, SLS (1993-2004, L37 & LD8 Northstar V8)
Failure mileage range
80,000-120,000 miles
Typical failure window
Root cause
Fine-pitch aluminium head bolt threads fatigue and pull out of the block under thermal cycling, compromising head gasket seal and allowing combustion gases into the cooling system.
Repair options & estimated costs (UK ranges)
| Repair tier | Dealer price | Specialist price | What it involves | Longevity / suitability |
|---|---|---|---|---|
| Minor - Preventative Thread Repair - Time-Sert or stud kit installation before catastrophic failure | £2,500 - £4,000 | £1,800 - £3,200 | Drill out damaged threads, install steel inserts or studs, replace head gaskets and seals | Viable only if caught early before coolant loss; extends life 50k+ miles if done proactively |
| Full Replacement - Rebuilt Northstar Engine - Complete engine swap with upgraded components | £6,500 - £9,500 | £4,200 - £7,000 | Supply & fit of rebuilt L37/LD8 with Time-Sert block repair, new gaskets, cooling system refresh | Restores factory performance with improved durability; recommended for high-mileage or post-failure units |
Our recommendation
On a Seville STS/SLS worth £3,000-£8,000, preventative thread repair offers better value if the engine is otherwise sound. If coolant loss or overheating has already occurred, a rebuilt engine with upgraded head bolt solution is the only reliable long-term fix.
Compare rebuilt L37/LD8 engine prices for your Cadillac SevilleReplacement Engine Options
Cadillac Seville Engine TypesOptions, Costs & What to Expect
Every Cadillac Seville engine type is available through our UK network with typical price ranges based on variant, engine code and budget.
Cadillac Seville Reconditioned Engines (Recon)£2,800 - £5,200((supply only))
Cadillac Seville Rebuilt Engines£3,300 - £6,000((supply only))
Cadillac Seville Used Engines£1,200 - £3,500((supply only))
Cadillac Seville Remanufactured Engines£4,200 - £7,500((supply only))
Cadillac Seville Refurbished Engines£2,400 - £4,500((supply only))
Compare Cadillac Seville engine prices with vetted UK suppliers
All engine types include a minimum 12-month unlimited mileage warranty when sourced through EngineMarket. Prices are typical UK market ranges based on historical quote data from our network and depend on exact engine code, variant, mileage and supplier. Use our free comparison tool above - enter your registration to get tailored quotes for your specific Cadillac Seville within hours.
Engine Sizes
Cadillac Seville Engines by SizeFind the Right Displacement for Your Variant
Every displacement fitted to the Cadillac Seville across UK generations is listed below, with compatible engine codes, production years and common failure notes to help you identify the right replacement.
The 4.1L HT-4100 powered early third-generation Sevilles (1982-1987), representing Cadillac's first lightweight aluminium V8 but suffering from well-documented block porosity issues that drive replacement enquiries for classic models.
⚙
Engine Code(s)
HT-4100 (LT8)
▣
Compatible Models (UK)
Base, Elegante
ϟ
Power output
Verified by registration
△
Common Failure Points
Block porosity causing coolant/oil mixing, camshaft wear, intake gasket leaks
Production Years: 1982-1987
Compare Cadillac Seville 4.1L petrol engine pricesCadillac Seville Engines Fuel Type
Cadillac Seville Engines by Fuel Type
Choose your Cadillac Seville engine by fuel type to compare realistic replacement prices, known issues, and compatible UK supply options - from early HT-4100 petrol to Northstar V8 performance.
Cadillac Seville Petrol Engines
PetrolPetrol V8s powered every Seville generation, from the problematic HT-4100 to the high-output Northstar, with replacement demand dominated by Northstar head gasket concerns on 1993-2004 models.
Common Cadillac Seville Petrol Engine Families
- •L37/LD8 - Northstar 4.6L DOHC V8 (STS/SLS 1993-2004), head bolt thread failure risk
- •HT-4100/4500/4900 - Traditional OHV V8 series (1982-1993), block porosity and gasket issues
- •Classic 350ci/425ci - Early OHV V8s (1975-1985), age-related wear and carburetor concerns
Found In
- •Fifth Generation (1998-2004) - L37 (STS), LD8 (SLS)
- •Fourth Generation (1992-1997) - L37 (STS), LD8 (SLS), L26 4.9L (early)
- •Third Generation (1986-1991) - HT-4100, HT4500, L26 4.9L
Known For
- •Northstar L37/LD8: High performance but notorious head gasket failure at 80k-120k miles
- •HT series: Lightweight aluminium design but block porosity causes coolant/oil mixing
- •Classic V8s: Simple architecture but carburetor and timing chain wear on survivors
Typical Petrol Models
- •Seville STS (L37 Northstar)
- •Seville SLS (LD8 Northstar)
- •Seville Elegante (HT4500/4.9L)
1 of 2
Cadillac Seville Petrol Engines
PetrolPetrol V8s powered every Seville generation, from the problematic HT-4100 to the high-output Northstar, with replacement demand dominated by Northstar head gasket concerns on 1993-2004 models.
Common Cadillac Seville Petrol Engine Families
- •L37/LD8 - Northstar 4.6L DOHC V8 (STS/SLS 1993-2004), head bolt thread failure risk
- •HT-4100/4500/4900 - Traditional OHV V8 series (1982-1993), block porosity and gasket issues
- •Classic 350ci/425ci - Early OHV V8s (1975-1985), age-related wear and carburetor concerns
Found In
- •Fifth Generation (1998-2004) - L37 (STS), LD8 (SLS)
- •Fourth Generation (1992-1997) - L37 (STS), LD8 (SLS), L26 4.9L (early)
- •Third Generation (1986-1991) - HT-4100, HT4500, L26 4.9L
Known For
- •Northstar L37/LD8: High performance but notorious head gasket failure at 80k-120k miles
- •HT series: Lightweight aluminium design but block porosity causes coolant/oil mixing
- •Classic V8s: Simple architecture but carburetor and timing chain wear on survivors
Typical Petrol Models
- •Seville STS (L37 Northstar)
- •Seville SLS (LD8 Northstar)
- •Seville Elegante (HT4500/4.9L)
Cadillac Seville Diesel Engines
DieselA single diesel option, the Oldsmobile-sourced LF9 5.7L V8, was offered in early Sevilles (1978-1980) but remains rare in the UK with limited specialist support for replacements.
Common Cadillac Seville Diesel Engine Families
- •LF9 - Oldsmobile 5.7L diesel V8 (1978-1980), head gasket and injection pump failure risk
Found In
- •First/Second Generation (1978-1980) - LF9 diesel option on Base/Elegante trims
Known For
- •Pioneering diesel luxury during fuel crisis era but reliability challenges limited adoption
- •Head gasket failure from high cylinder pressures in aluminium heads
- •Injection pump wear causing hard starting and power loss on higher-mileage units
Typical Diesel Models
- •Seville Base diesel (LF9)
- •Seville Elegante diesel (LF9)
Not sure which fuel type your Cadillac Seville has- Enter your registration number above to instantly identify your engine code, fuel system and compatible replacement options - all backed by a minimum 12-month unlimited mileage warranty from UK Cadillac Seville specialists.
Engine YearsGet quotes for 1975-1979 Cadillac Seville replacement engines →
Cadillac Seville Engines by YearWhat Was Fitted & WhenCadillac Seville Engines by Year - What Was Fitted & When
This technical timeline covers all major engine changes across the Seville's production run (1975-2004), organised so UK owners can quickly identify their engine and compare rebuilt replacement prices from specialists.
⚙Key Changes
- ✓Introduction of downsized luxury sedan platform targeting European imports
- ✓Standard 425ci (7.0L) OHV V8 with Rochester Quadrajet carburetion
- ✓Optional LF9 5.7L diesel V8 added for 1978-1980 fuel economy focus
▣Main Engines
425ci(6.6L) OHV V8 - petrol (Base, Elegante)
LF95.7L OHV V8 - diesel (optional, 1978-1980)
▰Popular Models
- •Cadillac Seville Base
- •Cadillac Seville Elegante
🔧Known For
- ✓Pioneering compact luxury design with European-inspired styling
- ✓Traditional OHV architecture simple to service but carburetor issues common
- ✓Diesel option innovative but reliability concerns limited long-term appeal
- ✓Classic status driving collector restoration demand in UK market
Engine Codes Covered:
425ciLF9Not sure which year your Cadillac Seville was built- Enter your registration number and we'll identify the exact engine, model year, and compatible replacement options instantly - all backed by a minimum 12-month warranty from UK Cadillac Seville specialists.
FAQ