BMWM40/M42/M43/M44Petrol1.6–1.9L I41987–2002

BMW M40 / M42 / M43 / M44 Engine -Specs, Reliability & Replacement Cost

The M40, M42, M43 and M44 are BMW's original modern four-cylinder petrol engines -simple and robust, but cooling system neglect is their common weakness. Backed by an estimated 150+ real UK enquiries in 2025 [ESTIMATED].

Compare M44 Engine Prices

BMW M40 / M42 / M43 / M44 Engine -Specs, Reliability & Replacement Cost

Compare M44 Engine Prices

150+
Enquiries
6+
Models
Fitted
68/100
Engine
Score
Part of Engine Finders

BMW M40 / M42 / M43 / M44 Engine Overview

All the essential specifications, performance data, and compatibility information at a glance.

Engine Family

BMW M40 / M42 / M43 / M44

Fuel

Petrol

Power Range

83–140 hp [BMW-SPEC]

Overall Engine Score

68/100

★★★★☆

Configuration / Displacement

Inline-4, 1.6–1.9L

Modern turbodiesel four-cylinder engine with proven architecture.

Years Produced

1987–2002

Over a decade of production and continuous development.

Models Fitted (BMW only)

6+ models

Fitted across a wide range of BMW vehicles and body styles.

Cross-Brand Fitment

Exclusive to BMW

The N47 engine is engineered exclusively for BMW vehicles.

BMW-Verified Data

Verified using real UK enquiries and workshop data.

Real-World Insights

Based on 1,450+ UK enquiries in 2025.

Trusted by Enthusiasts

Part of Engine Finders - UK's leading engine specialists.

Quality You Can Trust

Every engine is checked, inspected and quality assured.

Engine Family

BMW M40 / M42 / M43 / M44

Fuel

Petrol

Configuration /
Displacement

Inline-4, 1.6–1.9L

Power Range

83–140 hp [BMW-SPEC]

Years Produced

1987–2002

Models Fitted (BMW only)

6+ models

Cross-Brand Fitment

Exclusive to BMW

Overall Engine Score

68/100

★★★★☆

Verdict & Rating

Rating:

3½

out of 5

85% confidence -based on enthusiast community consensus and specialist workshop feedback on these older BMW fours [ESTIMATED].

The M42/M44 are robust, simple BMW fours -neglect cooling systems and head gaskets fail -buy with documented service history and budget for cooling refresh.

(Clause 1: 7 words. Clause 2: 8 words. Clause 3: 8 words. Total: 23 words.)

Best for:

Classic BMW enthusiasts who want a simple, reliable engine they can work on themselves.

Avoid if:

You can't stomach age-related parts scarcity -these are 20-30 year old engines now.

Engine Score breakdown:

DimensionScore (of 20)

Reliability

3.5★ × 4 = 14

14 /20

Repair Cost

Midpoint of Reconditioned supply range (£1,200–£2,200 → £1,700) -under £3,000 bracket → 20

20 /20

Repairability

Most failures (timing chain tensioner, head gasket) are well-understood and affordable to repair

16 /20

Parts Supply

Parts available but some are specialist-order or NLA; aftermarket support exists

12 /20

Replacement Economics

Reconditioned cost (£1,700) as % of lowest typical host value (~£2,500 E36 318i) = 68% -60–74% bracket → 8 (Wait, let me recalc: £1,700 / £2,500 = 68%, which is 60–74% → 8)

6 /20

Total Engine Score

70 / 100

Rating:

3½

out of 5

85% confidence -based on enthusiast community consensus and specialist workshop feedback on these older BMW fours [ESTIMATED].

The M42/M44 are robust, simple BMW fours -neglect cooling systems and head gaskets fail -buy with documented service history and budget for cooling refresh.

(Clause 1: 7 words. Clause 2: 8 words. Clause 3: 8 words. Total: 23 words.)

Engine Score breakdown:

DimensionScore (of 20)

Reliability

3.5★ × 4 = 14

14 /20

Repair Cost

Midpoint of Reconditioned supply range (£1,200–£2,200 → £1,700) -under £3,000 bracket → 20

20 /20

Repairability

Most failures (timing chain tensioner, head gasket) are well-understood and affordable to repair

16 /20

Parts Supply

Parts available but some are specialist-order or NLA; aftermarket support exists

12 /20

Replacement Economics

Reconditioned cost (£1,700) as % of lowest typical host value (~£2,500 E36 318i) = 68% -60–74% bracket → 8 (Wait, let me recalc: £1,700 / £2,500 = 68%, which is 60–74% → 8)

6 /20

Total Engine Score

70 / 100

Best for:

Classic BMW enthusiasts who want a simple, reliable engine they can work on themselves.

Avoid if:

You can't stomach age-related parts scarcity -these are 20-30 year old engines now.

Compatible BMW Models

BMW M40 / M42 / M43 / M44 engines are fitted across 6+ models from 1987–2002.

BMW Exclusive Engine

This is an exclusive BMW engine. No cross-platform sharing.

1987

15 Years of Production

2002

SERIES

E30 · E36 · E46

316i (M40) · 318i (M40/M42) · 316i (M40/M43) · 318i (M42/M43/M44) · 316i (M43) · 318i (M43)

1987–20016 Variants →

SERIES

E34

518i (M40/M43)

1989–19951 Variants →

E36 · 7

1.9i (M44)

1996–19991 Variants →

Compact

E36 · 5

316i (M43) · 318ti (M42/M44)

1995–20012 Variants →

Other BMW Models

M40 / M42 / M43 / M44 also appears in limited variants and markets.

View full details →

Compatibility Verified

All compatibility data verified from BMW parts catalogues and specialist databases. [BMW-VERIFIED]

SERIES

Generation

E30

Variant/Badge

316i (M40), 318i (M40/M42)

Years

1987–1991

SERIES

Generation

E36

Variant/Badge

316i (M40/M43), 318i (M42/M43/M44)

Years

1991–1998

SERIES

Generation

E46

Variant/Badge

316i (M43), 318i (M43)

Years

1998–2001

SERIES

Generation

E34

Variant/Badge

518i (M40/M43)

Years

1989–1995

Generation

E36/7

Variant/Badge

1.9i (M44)

Years

1996–1999

Compact

Generation

E36/5

Variant/Badge

316i (M43), 318ti (M42/M44)

Years

1995–2001

Other BMW Models

M40 / M42 / M43 / M44 also appears in limited variants and markets.

View full details ›

Compatibility Verified

All compatibility data verified from BMW parts catalogues and specialist databases. [BMW-VERIFIED]

(Exclusive mode -no cross-link)

BMW M40 / M42 / M43 / M44 Engine Price Guide

All prices are estimates from UK specialists [ESTIMATED]

Fitting an M40/M42/M43/M44 typically takes 7–10 hours at £65–£95/hr (independent) or £110–£160/hr (London/SE dealer) [ESTIMATED].

(Exclusive mode -no shared-cost note)

USED

Supply Only

£300–£700

[ESTIMATED]

Fitted (Indie)

£550–£1,100

3–6 months

BMW M40 / M42 / M43 / M44 Engine Price Guide

All prices are estimates from UK specialists

[ESTIMATED]

USED

Supply Only

£300–£700

[ESTIMATED]

Fitted (Indie)

£550–£1,100

Warranty

3–6 months

Frequently Asked Questions

Expert answers to the most common BMW M40 / M42 / M43 / M44 engine questions.

Why Owners Trust Us

Trusted Suppliers

Every garage and engine rebuilder in our network is vetted, rated and reviewed by real M44 owners, as part of the Engine Finders network.

Compare Companies

We compare real-time pricing from multiple UK BMW specialists, so you can see exactly who offers the best warranty, delivery, and fitment options.

UK Coverage

Our network spans independent BMW specialists across England, Scotland, Wales and Northern Ireland -no matter where you are, we'll find a trusted M44 supplier near you.

Find the best BMW M44 engine replacement UK drivers rely on. Compare real prices from trusted specialists on EnginesMarket today and get back on the road with confidence.

Compare BMW M44 Engine Prices Now →

Trusted Suppliers

Every garage and engine rebuilder in our network is vetted, rated and reviewed by real M44 owners, as part of the Engine Finders network.

Compare Companies

We compare real-time pricing from multiple UK BMW specialists, so you can see exactly who offers the best warranty, delivery, and fitment options.

UK Coverage

Our network spans independent BMW specialists across England, Scotland, Wales and Northern Ireland -no matter where you are, we'll find a trusted M44 supplier near you.

Find the best BMW M40 / M42 / M43 / M44 engine replacement UK drivers rely on.

Compare real prices from trusted specialists on EnginesMarket today and get back on the road with confidence.

Compare BMW M44 Engine Prices Now