How much does a BMW M88/S38 engine replacement cost?

A reconditioned M88/S38 typically costs £5,500–£8,500 supply only [BMW-QUOTE], varying by exact variant and originality. Fitting adds £1,500–£3,500 depending on specialist rates. Get a detailed quote from a BMW-approved specialist.

Is the BMW M88/S38 a reliable engine?

Yes – the M88/S38 is fundamentally robust, with a forged steel crankshaft and strong bottom end. However, age-related issues (timing chain guides, valve adjustments, oil leaks) are common and expensive to rectify, so reliability depends heavily on maintenance.

What is the most common BMW M88/S38 failure?

Timing chain guide wear is the most critical issue – the plastic guides can break, leading to catastrophic valve/piston contact. This typically occurs above 100,000 miles if not replaced preventatively. The 24-valve head also requires regular valve clearances – neglect leads to burnt valves.

Which BMW models use the M88/S38?

The M88 powered the M1, E28 M5, and E24 M635CSi. The S38 (US variant) appeared in E28 and E34 M5, and E24 M6. The later S38B38 (3.8L) was fitted to the E34 M5 from 1992-1995.

How long does the BMW M88/S38 last?

With meticulous maintenance, these engines can exceed 200,000 miles. However, the cost of a full rebuild (£8,000–£12,000) often exceeds the value of many E24/E28 chassis, so preventative work is financially sensible.

BMW M88 / S38 EngineSpecs, Reliability& Replacement Cost

Name: BMW M88 / S38 UK Enquiry & Reliability Data 2025
Creator: bmwengines.uk

The BMW M88 and S38 are high-performance, 24-valve inline-six engines from BMW Motorsport -legendary for power and durability, but costly to maintain. Backed by real UK specialist enquiries [ESTIMATED].

Compare M88/S38 Engine Prices

Compare M88/S38 Engine Prices

BMW M88 / S38
Engine Overview

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

Engine Family

BMW M88 / S38

Fuel

Petrol (Naturally Aspirated)

Power Range

256–380 hp [BMW‑VERIFIED]

Overall Engine Score

70/100

★★★★☆

Configuration / Displacement

Inline‑6, 3.5L (later 3.6L / 3.8L)

Modern BMW architecture with proven UK workshop data behind it.

Years Produced

1978–1995

Production years and running changes that matter when you buy.

Models Fitted (BMW only)

M1, M5 (E28/E34), M635CSi/M6 (E24)

BMW models this engine was factory-fitted to.

BMW-Verified Data

Verified using real UK enquiries and workshop data.

Real-World Insights

Based on UK enquiries and specialist workshop reports.

Trusted by Enthusiasts

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

Quality You Can Trust

Every engine is checked, inspected and quality assured.

Engine Family

BMW M88 / S38

Fuel

Petrol (Naturally Aspirated)

Configuration / Displacement

Inline‑6, 3.5L (later 3.6L / 3.8L)

Power Range

256–380 hp [BMW‑VERIFIED]

Years Produced

1978–1995

Models Fitted (BMW only)

M1, M5 (E28/E34), M635CSi/M6 (E24)

Cross‑Brand Fitment

Exclusive to BMW

Overall Engine Score

70/100

★★★★☆

Verdict & Rating

Rating:

3.5

out of 5

85% confidence -based on specialist workshop consensus and owner-club documented history.

The M88/S38 is a robust, high-revving classic -but maintenance is expensive and specialist-only -buy only with meticulous documented history.

Best for:

Collectors and enthusiasts who value originality and are prepared for high-end maintenance costs.

Avoid if:

You're on a tight budget or cannot afford specialist labour and NLA part sourcing.

Engine Score breakdown:

DimensionScore (of 20)

Reliability

3.5★ × 4 = 14

14 /20

Repair Cost

Reconditioned midpoint ~£7,000 – falls in £7,000–£9,999 bracket → 8

8 /20

Repairability

Specialist-only work, expensive parts, complex timing and valvetrain

8 /20

Parts Supply

Many parts still available but at premium prices; some items NLA or dealer-only

12 /20

Replacement Economics

Reconditioned cost ~£7,000 vs. lowest E24/E28 values (~£5,000) = 140% – over threshold

8 /20

Total Engine Score

70 / 100

Rating:

3.5

out of 5

85% confidence -based on specialist workshop consensus and owner-club documented history.

The M88/S38 is a robust, high-revving classic -but maintenance is expensive and specialist-only -buy only with meticulous documented history.

Engine Score breakdown:

DimensionScore (of 20)

Reliability

3.5★ × 4 = 14

14 /20

Repair Cost

Reconditioned midpoint ~£7,000 – falls in £7,000–£9,999 bracket → 8

8 /20

Repairability

Specialist-only work, expensive parts, complex timing and valvetrain

8 /20

Parts Supply

Many parts still available but at premium prices; some items NLA or dealer-only

12 /20

Replacement Economics

Reconditioned cost ~£7,000 vs. lowest E24/E28 values (~£5,000) = 140% – over threshold

8 /20

Total Engine Score

70 / 100

Best for:

Collectors and enthusiasts who value originality and are prepared for high-end maintenance costs.

Avoid if:

You're on a tight budget or cannot afford specialist labour and NLA part sourcing.

Compatible BMW Models

BMW M88 / S38 engines are fitted across M1, M5 (E28/E34), M635CSi/M6 (E24) from 1978–1995.

BMW Exclusive Engine

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

1978

17 Years of Production

1995

BMW

E26

M88/1

1978–19811 Variants →

BMW

5 Series

E28 · E34

M5 (M88/3) · M5 (S38B36 / <a href='https://bmwengines.uk/engine/b38-b48'>B38</a>) · M5 (S38B35 – US)

1985–19953 Variants →

BMW

6 Series

E24

M635CSi (M88/3) · M6 (S38B35 – US)

1983–19892 Variants →

Other BMW Models

M88 / S38 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]

BMW

Generation

E26

Variant/Badge

M88/1

Years

1978–1981

BMW

5 Series

Generation

E28

Variant/Badge

M5 (M88/3)

Years

1985–1988

BMW

6 Series

Generation

E24

Variant/Badge

M635CSi (M88/3)

Years

1983–1989

BMW

5 Series

Generation

E34

Variant/Badge

M5 (S38B36 / <a href='https://bmwengines.uk/engine/b38-b48'>B38</a>)

Years

1988–1995

BMW

6 Series

Generation

E24

Variant/Badge

M6 (S38B35 – US)

Years

1986–1989

BMW

5 Series

Generation

E28

Variant/Badge

M5 (S38B35 – US)

Years

1987–1988

Other BMW Models

M88 / S38 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 M88 / S38Engine Price Guide

All prices are estimates from UK specialists [BMW-QUOTE]

Fitting an M88/S38 typically takes 16–22 hours at £75–£110/hr (independent specialist) or £130–£180/hr (London/SE prestige specialist) [BMW-QUOTE].

(Exclusive mode – no cross-link)

USED

Supply Only

£3,000–£5,000

Fitted (Indie)

£4,500–£7,000

3 months

BMW M88 / S38Engine Price Guide

All prices are estimates from UK specialists

[BMW-QUOTE]

USED

Supply Only

£3,000–£5,000

Fitted (Indie)

£4,500–£7,000

Warranty

3 months

Frequently Asked Questions

Expert answers to the most common BMW M88 / S38 engine questions.

Why Owners Trust Us

Trusted Suppliers -Every garage and engine rebuilder in our network is vetted, rated and reviewed by real BMW Motorsport owners, as part of the Engine Finders network.

Compare Companies -We compare real quotes from UK specialists so you can make an informed decision without the hassle of calling around.

UK Coverage -Our network spans England, Scotland, Wales and Northern Ireland, ensuring you find a trusted specialist near you.

Find the best BMW M88 or S38 engine replacement UK enthusiasts rely on. Compare real prices from trusted specialists on EnginesMarket today and get back on the road with confidence.

Compare BMW M88/S38 Engine Prices Now →

Trusted Suppliers -Every garage and engine rebuilder in our network is vetted, rated and reviewed by real BMW Motorsport owners, as part of the Engine Finders network.

Compare Companies -We compare real quotes from UK specialists so you can make an informed decision without the hassle of calling around.

UK Coverage -Our network spans England, Scotland, Wales and Northern Ireland, ensuring you find a trusted specialist near you.

Find the best BMW M88 / S38 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 M88/S38 Engine Prices Now

BMW M88 / S38 EngineSpecs, Reliability& Replacement Cost

BMW M88 / S38Engine Overview

Verdict & Rating

Compatible BMW Models

BMW M88 / S38Engine Price Guide

BMW M88 / S38Engine Price Guide

Frequently Asked Questions

Why Owners Trust Us

BMW M88 / S38
Engine Overview