BMW 3 Series 325e Engine ReplacementCompare Prices & Get Quotes
Get free, no-obligation quotes today from trusted UK BMW 3 Series 325e engine specialists. Compare prices on reconditioned, rebuilt and used engines for the iconic E30 325e - powered by the legendary 2.7-litre M20B27 'Eta' six-cylinder.
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12-Month Warranty
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From £1,800 to £3,500
Used from £800 · Reconditioned from £1,500 · Common codes: M20B27
From £800
Tested, bare/short engine
From £1,500
Rod bearings addressed, tested
From quote
Upgraded bearings, full teardown, revised valvetrain
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3 Simple Steps3 Simple Stepsto Finding the Best BMW 3 Series 325e Replacement Engineto Finding the Best BMW 3 Series 325e Replacement Engine
Most replacements completed within 3-5 days.
Variant HistoryBMW 3 Series 325e - Engine History & Specs at a Glance
The BMW 325e (the 'e' standing for 'Eta' - the Greek letter used by BMW to denote efficiency) was introduced in 1984 as a torque-focused, fuel-efficient alternative to the higher-revving 325i. Powered by the 2.7-litre M20B27 six-cylinder, the 325e prioritised low-end grunt over peak power, making it a relaxed and economical cruiser. The 325e was produced throughout the E30 generation's lifespan, with a catalyst-equipped version arriving in 1985.
Variant HistoryBMW 3 Series 325e - Engine History & Specs at a Glance
The BMW 325e (the 'e' standing for 'Eta' - the Greek letter used by BMW to denote efficiency) was introduced in 1984 as a torque-focused, fuel-efficient alternative to the higher-revving 325i. Powered by the 2.7-litre M20B27 six-cylinder, the 325e prioritised low-end grunt over peak power, making it a relaxed and economical cruiser. The 325e was produced throughout the E30 generation's lifespan, with a catalyst-equipped version arriving in 1985.
BMW 3 Series 325e
Fuel TypePetrol
Engine Size2.7L (2,693cc)
Power Output121-129hp across the variant's historyEngine History Timeline
1985 (E30 pre-facelift) - M20B27 2.7-litre 12-valve SOHC, 121hp, Bosch Motronic fuel injection
1987 (E30 facelift catalyst) - M20B27, 2.7-litre 12-valve SOHC, 122hp (catalyst version 129hp in some markets), 230Nm torque
1988 (E30 facelift late) - M20B27, 2.7-litre 12-valve SOHC, continued with minor emissions updates
Key Specs Snapshot
Fuel TypePetrolEngine Size2.7L (2,693cc)Power Output121-129hp across the variant's historyYears Produced1984-1988 (UK)Every engine fitted to the BMW 3 Series 325e is covered below, with UK rebuilt pricing and known failure points.
BMW 3 Series 325e Engine Codes - Specifications & Replacement CostBMW 3 Series 325e Engine Codes - Specifications & Replacement Cost
2.7-litre Petrol (1984-1988, E30 325e)
Power Output121hp (early) / 122-129hp (catalyst)Torque170 lb-ft at 3,250rpmYears Fitted1984-1988Notable FeaturesLong-stroke 'Eta' engine design (84mm bore x 81mm stroke); Bosch Motronic fuel injection; interference engine design
Compatible Trim Levels
- 325e (standard)
- 325e (catalyst)
- 325e (automatic)
- 325e (5-speed manual)
Find your exact engine code, specs and UK replacement cost guide.
Used
Tested, ready-to-fit engine
£800-£1,500
Reconditioned
Addressed known issues, tested
£1,500-£2,200
Rebuilt
Full teardown, upgraded internals
£1,800-£3,500
Common Failure
The M20B27 is an interference engine - if the timing belt breaks, valves will strike pistons, causing catastrophic engine damage. The timing belt should be replaced every 4 years or 50,000-60,000 miles. Vacuum leaks are also common, causing idle issues. Cooling system components (water pump, plastic fittings) degrade with age and can cause overheating.
The BMW 325e is powered by the M20B27 'Eta' six-cylinder - a long-stroke, torque-focused engine that is generally robust when properly maintained. However, age and neglect bring several well-documented failure points. The M20B27 is an interference engine, meaning timing belt failure is catastrophic. Rebuilt engines through EnginesMarket include new timing components and are backed by a minimum 12-month unlimited-mileage warranty.
Why the BMW 3 Series 325e M20B27 is an Interference Engine
Affected Vehicles
BMW 3 Series 325e (M20B27, 1984-1988)
Typical Failure Mileage
50k-60k (or 4 years, whichever comes first)
Root Cause
The M20B27 uses a rubber timing belt, not a chain. Over time, the belt stretches, frays, or snaps. As an interference engine, if the timing belt breaks, the camshaft stops turning while the crankshaft continues - valves collide with pistons, bending valves and often destroying the cylinder head.
Why It Happens
The M20B27 uses a rubber timing belt, not a chain. Over time, the belt stretches, frays, or snaps. As an interference engine, if the timing belt breaks, the camshaft stops turning while the crankshaft continues - valves collide with pistons, bending valves and often destroying the cylinder head.
Dealer (parts + labour)
£600-£1,000
Specialist (parts + labour)
£400-£700
What it involves
New belt, tensioner, water pump, seals - the 'full kit'
Suitability
Best done every 50k miles or 4 years - cheap insurance against catastrophic failure
1 - 2 daysDealer (parts + labour)
£1,200-£2,000
Specialist (parts + labour)
£900-£1,600
What it involves
Remove head, replace bent valves, skim head, new gasket set
Suitability
Only viable if pistons are undamaged and head is not cracked
1 - 2 daysDealer (parts + labour)
£3,500-£5,500
Specialist (parts + labour)
£1,800-£3,500
What it involves
Complete engine with new timing components, 12-month warranty
Suitability
Recommended if belt snapped at speed causing extensive damage
1 - 2 daysAll prices are indicative UK market ranges based on current UK specialist supplier data.| Repair Tier | Dealer (Parts + Labour) | Specialist (Parts + Labour) | What It Involves | Suitability | Estimated Time |
|---|---|---|---|---|---|
 Timing belt & water pump replacement (preventative) Minor | £600-£1,000 | £400-£700 | New belt, tensioner, water pump, seals - the 'full kit' | Best done every 50k miles or 4 years - cheap insurance against catastrophic failure | 1 - 2 days |
 Cylinder head rebuild (after belt failure, minor damage) Best Value | £1,200-£2,000 | £900-£1,600 | Remove head, replace bent valves, skim head, new gasket set | Only viable if pistons are undamaged and head is not cracked | 1 - 2 days |
Full engine replacement - rebuilt/reconditioned Best Value | £3,500-£5,500 | £1,800-£3,500 | Complete engine with new timing components, 12-month warranty | Recommended if belt snapped at speed causing extensive damage | 1 - 2 days |
Vehicle Value Check
Vehicle Value Check
A typical BMW 3 Series 325e is worth approximately £3,217-£11,824 depending on condition. - Vehicle worth under ~£5,000: a used engine or timing belt replacement typically makes more sense than a full rebuilt unit. - Vehicle worth ~£5,000-£8,000: evaluate both; reconditioned is viable if keeping the car as a long-term classic. - Vehicle worth ~£8,000-£12,000+: reconditioned/rebuilt usually justifies the premium via warranty and reliability - especially for a matching-numbers car.
Our Recommendation
Our Recommendation
Prevention is everything on the M20B27. If you have no record of the timing belt being changed in the last 4 years or 50,000 miles, replace it immediately - a £400-£700 preventative job is far cheaper than a £1,800-£3,500 engine replacement. If the belt has already snapped, assess the damage carefully; if the head is cracked or pistons damaged, a reconditioned or rebuilt engine is the most reliable path forward.
Don't Let Engine Failure Write Off Your BMW 3 Series 325e
The E30 325e is a modern classic - and with only a handful of years of production, keeping yours on the road with the correct M20B27 engine is essential. Whether you need a preventative timing belt change or a full engine replacement, our network of vetted specialists can help. Compare quotes today and keep your 325e running for years to come.
Compare rebuilt M20B27 BMW 3 Series 325e engine prices
12-Month Minimum
UK Specialists Vetted
Best Price GuidanceImportant Information
Important Information
"All prices are indicative UK market ranges based on historical quote data and repair requests from our network of engine specialists. Dealer pricing is estimated based on published main dealer labour rates and genuine OEM parts pricing. Specialist pricing reflects actual quote data from EnginesMarket's UK network. Actual costs vary depending on damage severity, vehicle condition, variant, and workshop location within the UK. Use our free comparison tool to get tailored quotes for your specific BMW 3 Series 325e. Every engine supplied through EnginesMarket carries a minimum 12-month unlimited mileage warranty - always confirm exact terms with your chosen supplier."
BMW 3 Series 325e Engine ReplacementFrequently Asked Questions
Question 1How much does a BMW 3 Series 325e engine replacement cost-
A BMW 3 Series 325e engine replacement typically costs £1,800-£3,500 for a rebuilt unit supply-only, or £2,500-£4,800 fitted by a specialist. Used engines start from around £800-£1,500, while reconditioned units range from £1,500 to £2,200.
- Prices reflect the M20B27's increasing rarity and classic car status
- Rebuilt engines carry a 12-month unlimited-mileage warranty
- Supply & fit adds £400-£800 in labour
Question 2What are the signs of timing belt failure in a BMW 325e-
The most critical sign is simply age - if the belt is over 4 years old or has covered more than 50,000 miles, it needs replacing regardless of symptoms. Other warning signs include a squealing noise from the front of the engine, visible cracks or fraying on the belt (if inspected), or rough running.
- The M20B27 is an interference engine - belt failure bends valves
- Preventative replacement (£400-£700) is far cheaper than engine replacement (£1,800-£3,500)
- Always check service history before buying a 325e
Question 3Is it worth replacing the engine in a BMW 3 Series 325e-
It depends on the car's condition and your intentions. A 325e in average condition is worth approximately £3,217-£11,824. For a car valued under £5,000, a used engine or repair is often more sensible. For a clean, low-mileage example with rising classic values, a rebuilt engine with warranty is a justifiable investment.
- Matching-numbers engines matter for collector value
- For sub-£5k cars, consider a used engine (£800-£1,500) rather than a rebuild
- For cars with classic potential, a rebuilt unit preserves originality and reliability
Question 4What's the difference between the 325e and 325i engines-
The 325e uses the M20B27 'Eta' engine - a 2.7-litre long-stroke design with a 81mm stroke and 84mm bore, producing 121hp and 170 lb-ft of torque at just 3,250rpm. The 325i uses the M20B25 - a 2.5-litre short-stroke design with a 75mm stroke and the same bore, producing 168hp but with less low-end torque. The 'e' stands for 'Eta' - efficiency.
- 325e: torque-focused, relaxed cruiser, better fuel economy
- 325i: higher-revving, more peak power, sportier character
- Both are interference engines with timing belts
Question 5How long does a BMW 3 Series 325e engine replacement take-
A typical BMW 3 Series 325e engine replacement takes 2-3 days for a specialist workshop, assuming the replacement engine is available. The E30 platform is relatively straightforward to work on.
- Allow 2-3 days for supply & fit through a specialist
- Supply-only engines are typically dispatched within 1-2 working days
- Timing belt replacement is a half-day job
Question 6What warranty comes with a BMW 325e replacement engine-
Every rebuilt and reconditioned BMW 3 Series 325e engine supplied through EnginesMarket carries a minimum 12-month unlimited-mileage warranty. Used engines typically come with a shorter warranty (30-90 days) depending on the supplier - always confirm exact terms before purchasing.
- Rebuilt: 12 months / unlimited mileage minimum
- Reconditioned: typically 6-12 months
- Used: 30-90 days, supplier-dependent
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The BMW 3 Series 325e is a modern classic - and finding the right engine for it requires specialist knowledge. Our network of vetted UK specialists understands the unique M20B27 'Eta' engine and can supply the correct replacement for your car. Enter your registration, get free, no-obligation quotes, and keep your 325e on the road with the engine it deserves.
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