8
verified 1991 bmw engines
1991 Used BMW Engines For Sale
8 verified 1991 BMW engines in stock — E30 3 Series (1.8L M42 four, 2.5L M20 six), E34 5 Series (2.5L M50, 3.4L M30) and the S38-powered M5, E32 7 Series (3.4L M30 735i, 5.0L M70 V12 750i), and the E31 850i 5.0L V12. Every unit is VIN-matched to your car, compression-tested by ASE-certified technicians, photographed before shipment, and backed by up to a 3-year warranty plus 30-day money-back. Free freight nationwide.
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Compression-Tested & Verified
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Free Nationwide Shipping
Browse 1991 BMW Engines by Model
Match your 1991 BMW engine by vehicle. Use the cards below to identify the right chassis and engine family — every unit is then VIN-matched at the order step. Not sure whether your car left the factory with an M20 or an M50 six? Text us your VIN and a specialist confirms the match.
Why Buy a 1991 BMW Engine from Auto Power Source
Thirty-plus-year-old BMW engines are only worth buying when someone has actually opened them up and checked — which is exactly what we do. Every 1991 BMW engine here is pulled from an inventory-verified donor, cataloged by VIN, and run through our six-step inspection: VIN-matching, compression testing, noise & smoke verification, full visual inspection, multi-angle photography, and palletized shipping.
Our ASE-certified technicians compression-test every cylinder and run a leak-down evaluation before any M20, M30, M42, M50, M70, or S38 unit is cleared for sale — the failure modes on these engines (M20 timing belts, M30 head gaskets, M70 twin-ECU faults) are exactly what static inspection alone misses. You ship free on a heavy-duty pallet anywhere in the continental U.S. with up to a 3-year warranty plus 30-day money-back. Not sure which 1991 variant fits? Text your VIN and we will confirm.
📱 Fastest way to match: text us your VIN, get options in minutes.Text Your VIN →
Your 1991 BMW Engine Options: Compared
Most 1991 BMW owners face four real choices when their engine fails — and on a car this age, new OEM is rarely even orderable:
← Swipe sideways to see all columns →
| Option |
Cost |
Reliability |
Warranty |
Fitment Match |
| Used OEM (this collection) |
$$$ Best Value |
High |
Up to 3 years |
VIN-matched |
| New OEM (dealer) |
$$$$$ rarely available |
High |
Manufacturer |
Exact |
| Aftermarket / Reman |
$$$$ |
Varies |
6-12 mo |
May adapt |
| Junkyard |
$ Cheapest |
Unknown |
None |
DIY |
Tested used OEM hits the sweet spot — original BMW engineering, verified before it ships, at a fraction of reman pricing.
1991 BMW Engine Buying Guide
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Identify the engine family, not just the displacement. 1991 BMW inventory spans M42 (1.8L four), M20 and M50 (2.5L sixes), M30 (3.4L six), M70 (5.0L V12), and S38 (3.5L M5). A 2.5L E30 325i M20 and a 2.5L E34 525i M50 are not the same engine.
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Confirm the chassis code. E30, E34, E32, and E31 are all in this model year. Mounts, sumps, accessory brackets, and wiring differ by chassis even where the block is shared.
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V12 cars need extra verification. The 750i (E32) and 850i (E31) share the M70 V12 but not the ancillaries; the twin-ECU management means a mismatched donor creates diagnostic headaches.
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Check the emissions calibration for your state. 1991 BMW units were built to California and 49-state specs — the wrong calibration can fail an inspection even when the engine bolts in.
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Always run the donor VIN. We provide it on request for any engine in our inventory so you can verify mileage and history before you commit.
Our ASE-certified technicians verify every one of these points against your VIN before any engine ships.
Frequently Asked Questions
What is the warranty on a 1991 BMW engine?
Up to 3 years, depending on the specific unit. The exact warranty term is listed on each product page.
What does compression-tested mean?
ASE-certified technicians compression-test every cylinder and run a leak-down evaluation before a 1991 BMW engine is cleared for sale. On engines of this age that check is the difference between a usable unit and a core.
How long until delivery?
Prep and ship time is 3-5 business days. Transit time is 2-3 business days via freight carrier after dispatch.
Can I see photos before I buy?
Yes. Multi-angle photos of the actual 1991 BMW unit are sent for your approval before payment.
Do I need my VIN?
Strongly recommended. 1991 BMW engines vary by chassis (E30 / E34 / E32 / E31), engine family, and emissions calibration — the VIN is the only reliable way to resolve all three.
What if I do not approve the photos?
Every dollar back — no restocking fees, no return freight charges.
Why is this cheaper than the dealer?
These are original BMW engines pulled from inventory-verified donor vehicles rather than newly manufactured units. You get the same factory engineering — and on a 1991 car, new OEM is rarely orderable at all.
When can I reach customer service?
24h Mon-Sat at 1-877-313-8995, or text your VIN any time and we will come back to you with options.
46,000+
engines + transmissions shipped
0%
fitment-related returns
All 50
states covered, free freight
Excellent
Customer Reviews
rated on Trustpilot
Our 6-Step Inspection & Shipping Process
Every 1991 BMW engine we ship has been through these six steps:
1. VIN-MatchingWe match the donor VIN to your VIN to confirm chassis code, engine family, emissions calibration, and drivetrain fit.
2. Tested & VerifiedASE-certified technicians compression-test every cylinder and run a leak-down evaluation on each engine.
3. Noise & Smoke VerificationUnits are run to verify normal mechanical sound and clean operation — catches the timing-gear and guide wear static tests miss.
4. Visual InspectionEvery accessible component is inspected: manifolds, valve covers, accessory drives, and sensor harnesses.
5. Photograph & CatalogMulti-angle photos sent to you BEFORE we ship, for your approval.
6. Palletize & ShipStrapped on a heavy-duty wooden pallet, shipped via freight at no charge.
What Our Customers Say
Rated Excellent by our customers on Trustpilot.
★★★★★
Transaction was perfect
"Found me the right engine at a great price. Got it in 2 days and installed the car the next day. Runs absolutely beautiful."
— Kevin Graham, 2026-04-29
★★★★★
Repeat customer
"AutoPowerSource is a great company. I've used them several times for used motors. Low mileage when other companies gave up."
— Curtis Haines, 2025-12-23
★★★★★
Highly recommend Mike
"Mike reached out first thing in the morning regarding my inquiry for a used engine. Very informative and helpful."
— Beatrice, 2026-03-31
★★★★★
Great experience
"Daisy kept me in the loop every step. My original engine was damaged before shipping; she found a different one quickly."
— Bryan Perkins, 2026-03-25
Our Photos-Before-Shipment Guarantee
Before any 1991 BMW 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 up to a 3-year warranty.
✉ Email Us at info@autopowersource.com
