2020 Used BMW Engines For Sale

42
verified 2020 BMW engines
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Up to 3 yrs
extended warranty available
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shipment

2020 Used BMW Engines For Sale

42 verified 2020 BMW engines in stock, across ten distinct families — the 2.0L B46/B48 four, the 3.0L B58 six in standard and M Performance tune, the S55 in the final F8x M2 Competition and M4, the 4.4L N63 V8 at 456 hp, 523 hp and 600 hp Alpina, and both i3 drivetrains. Every unit is VIN-matched, ASE-tested by certified technicians and photographed before shipment, with a warranty included and free freight nationwide.

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Warranty On Every Unit
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Photos Before Shipment
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ASE-Tested & Verified
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Free Nationwide Shipping
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30-Day Money-Back
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2020 BMW Engine Families

Which engine sits under which 2020 BMW, and how many of each we hold today.

Engine family Fits (2020) In stock
B46/B48 2.0L TwinPower Turbo-4 228i, 230i, 330i, 430i, 530i in RWD and xDrive, X1 28i, X2 28i, X3 30i (gasoline, w/o PHEV), X4 30i 15
B58 3.0L TwinPower Turbo Inline-6 440i and 440i xDrive, 740i xDrive, 840i and 840i Gran Coupe, X5 and X7 xDrive40i 7
N63 4.4L TwinPower Turbo V8 — 523 hp M550i xDrive, M850i, 750i and 750Li xDrive, X5 M50i, X7 M50i 6
B58 3.0L high output — M Performance M240i, M240i xDrive, X3 M40i — own turbo, pistons, cooling and ECU map; not interchangeable with a 40i or 440i 4
S55 3.0L M TwinPower Turbo M2 Competition and M4 — final F8x model year; hand-built M block, not a B58 2
N63 4.4L TwinPower Turbo V8 — 456 hp X5 xDrive50i and X7 xDrive50i — lower-output N63 tune, different turbos and cooling from the M50i 2
i3 eDrive electric drive unit i3 and i3s battery-electric — motor and gearbox assembly, no combustion hardware at all 2
W20K06 0.65L range-extender twin i3 REx and i3s REx only — the 647 cc two-cylinder generator set, not a traction unit 2
B48TU 2.0L high output M235i xDrive Gran Coupe, 301 hp — own turbo, pistons and cooling, not a 228i/230i unit 1
N63 4.4L V8 — Alpina high output Alpina B7 xDrive, 600 hp — Alpina-specific turbochargers, cooling and calibration 1
Total 42

Other BMW Model Years

Every model year we hold BMW engines for. Years without a link are in stock but have no year page yet — text us your VIN.

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Why Buy a 2020 BMW Engine from Auto Power Source

2020 is the model year where BMW's modular engine range is at its widest, and that is exactly why the engine code matters more than the displacement. A 2020 car badged 2.0L can carry a B46 or a B48 in standard tune, or the B48TU in the 301 hp M235i. A 3.0L can be a standard B58 out of a 440i or an X5 xDrive40i, the high-output B58 out of an M240i or X3 M40i, or the hand-built S55 out of an M2 Competition or M4. We stock all of them for 2020, and we hold them apart rather than letting one 3.0L stand in for another.

The same discipline applies to the 4.4L V8 cars. We list the N63 at its stated output — 456 hp in the X5 and X7 xDrive50i, 523 hp in the M550i, M850i, 750i and the X5 and X7 M50i, and 600 hp in the Alpina B7, where the turbochargers, cooling pack and calibration are Alpina's own. Those are not one part with three badges, and a page that lumped them together would be setting a buyer up for a return.

2020 is also the only point in the BMW range where you can buy two completely different i3 drivetrains under one nameplate. The battery-electric i3 and i3s ship as a motor and gearbox assembly with no combustion hardware at all; the REx cars add a 647 cc two-cylinder generator set that never drives the wheels. We hold both, we label both, and we will tell you which one your car left the factory with before you pay for anything.

Everything here is used OEM, pulled from low-mileage donor vehicles, cataloged on arrival and held indoors pending sale. Our ASE-certified technicians compression-test every cylinder and run a leak-down evaluation, then a noise and smoke check on the test stand, before any unit is approved for sale. You see multi-angle photographs of the actual engine before it ships, and if you do not approve them you get every dollar back with no restocking fee and no return freight charge.

📱 Fastest way to match: text us your VIN, get options in minutes.Text Your VIN →

Your 2020 BMW Engine Options: Compared

Most 2020 BMW owners face four real choices when the engine fails:

← Swipe sideways to see all columns →
Option Cost Reliability Warranty Fitment Match
Used OEM (this collection) $$$ Best Value High — tested Included VIN-matched
New OEM (dealer) $$$$$ 2-4× more High Manufacturer Exact
Aftermarket / Reman $$$$ Varies 6-12 mo May adapt
Junkyard $ Cheapest Unknown None DIY

Tested used OEM hits the sweet spot — same engineering as new, fraction of the cost.

2020 BMW Engine Buying Guide

5 things to verify before buying a used 2020 BMW engine:

  1. Read the engine code, not the displacement. On a 2020 BMW the litre figure settles almost nothing. 2.0L spans the B46, the B48 and the high-output B48TU; 3.0L spans the standard B58, the M Performance B58 and the S55; 4.4L spans three different N63 tunes. Work from the code and the stated output, and treat the displacement as a filter rather than an answer.
  2. Keep the high-output engines separate from the standard ones. The M240i, X3 M40i and M235i do not run a tuned version of the ordinary engine — they run their own turbocharger, pistons, charge cooling and ECU calibration. A standard B58 will not stand in for an M Performance B58, and the swap does not work in the other direction either. The same holds for the S55 in the M2 Competition and M4, which shares no long block with any B58.
  3. Confirm RWD against xDrive before you commit. Oil pan profile, sump pickup, front-axle clearance, accessory brackets and harness routing can all differ between a rear-drive car and its xDrive twin, even where the long block is identical. Two of our 2020 rows carry a drivetrain label that reads against the nameplate — our team resolves those against the build record on request rather than guessing from the title.
  4. Decide between i3 eDrive and i3 REx at the start. These are not variants of one part. The battery-electric cars use a motor and single-speed gearbox assembly; the REx cars add a 647 cc two-cylinder generator with its own mounts, cooling, exhaust and fuel system. Ordering the wrong one is not a fitment adjustment, it is a different vehicle architecture.
  5. Confirm the match with your own VIN before you order. Your VIN settles the engine code, drivetrain and build split in one step. Text it to +1-307-441-5554 and we will confirm in writing exactly which unit fits your vehicle before you pay.

Our ASE-certified technicians verify every one of these points against your VIN before any unit ships.

📞 Need help choosing the right 2020 BMW engine? Talk to our team live.Call 1-877-313-8995

Frequently Asked Questions

Which engine families do you stock for 2020 BMW?
Ten, across 42 live units: B46/B48 2.0L TwinPower Turbo-4 (15), B58 3.0L inline-6 standard output (7), N63 4.4L V8 at 523 hp (6), B58 3.0L high output for M Performance cars (4), S55 3.0L M twin-turbo (2), N63 4.4L V8 at 456 hp (2), i3 eDrive electric units (2), W20K06 0.65L range-extender twins (2), B48TU 2.0L high output (1) and the Alpina-tuned N63 (1).
What does ASE-tested mean?
ASE-certified technicians compression-test every cylinder and run a leak-down evaluation, plus noise and smoke verification on the test stand, visual inspection of housings, manifolds, accessories and harnesses, and multi-angle photography before shipment.
Is the M240i engine the same as the 440i or X5 xDrive40i engine?
No. All three are B58 3.0L inline-sixes, but the M240i and X3 M40i run the M Performance specification — a different turbocharger, different pistons, a larger charge cooler and its own ECU calibration. We list them as separate families for that reason, and we do not substitute one for the other in either direction.
Why do you list the 4.4L V8 three different ways?
Because 2020 uses three distinct N63 builds. The X5 and X7 xDrive50i are the 456 hp tune; the M550i, M850i, 750i, 750Li and the M50i SUVs are the 523 hp tune; the Alpina B7 is 600 hp on Alpina's own turbochargers, cooling and calibration. Turbos, cooling and software differ, so they are not interchangeable.
Is the 2020 M4 engine an S55 or a B58?
S55. 2020 is the final F82/F83 M4 model year, and both the M4 and the M2 Competition carry the hand-built S55 3.0L M TwinPower Turbo. It is not a B58 derivative and shares no long block with one.
What is the difference between an i3 and an i3 REx unit?
The battery-electric i3 and i3s ship as an electric motor and single-speed gearbox assembly with no combustion hardware. The REx cars add a 647 cc two-cylinder generator set that charges the battery and never drives the wheels — separate mounts, cooling, exhaust and fuel system. Tell us which one your car has and we will match it exactly.
Do I need my VIN?
Yes — essential on a 2020 BMW. One displacement can cover three engine families, and the chassis code plus build split decides harness and mounting fit. Text your VIN to +1-307-441-5554 and we will confirm the exact unit in writing.
What is the warranty, and how fast does it ship?
Every 2020 BMW engine ships with a warranty included; the standard term is printed on each product page and extended coverage of up to 3 years is available at checkout. Prep and ship time is 3-5 business days, with 2-3 business days in transit by freight carrier, and freight is free nationwide.
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100K+
Engines+Transmissions In Stock
0%
fitment-related returns
All 50
states covered, free freight
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brands covered

Our 6-Step Inspection & Shipping Process

Every 2020 BMW engine we ship has been through these six steps:

1. VIN-Matching
We match the donor VIN to your VIN to confirm engine code, chassis code, LCI status, and drivetrain fit.
2. Tested & Verified
ASE-certified technicians compression-test every cylinder and run leak-down evaluation on engines. Transmissions are Shift-Tested through all gears.
3. Noise & Smoke Verification
Units are run to verify normal mechanical sound and clean operation — catches internal wear static tests miss.
4. Visual Inspection
Every accessible component is inspected: turbos, manifolds, VANOS solenoids, oil-feed plumbing, accessories, sensor harnesses.
5. Photograph & Catalog
Multi-angle photos sent to you BEFORE we ship for your approval.
6. Palletize & Ship
Strapped on a heavy-duty wooden pallet, shipped via freight at no charge.

Our Photos-Before-Shipment Guarantee

Before any engine leaves our warehouse, we send you multi-angle photographs. You approve. If you do not approve, you get every dollar back — no questions, no restocking fees, no return freight charges. On top of 30-day money-back and the warranty included with every unit. Browse all 42 2020 BMW engines below.

✉ Email Us at info@autopowersource.com
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