BMW F80/F82 M3 M4 S55 Long Block Engine (2015–2020)

Unlock the power of the legendary S55 platform with this OEM Long Block Engine from a 2015 BMW M4 (VIN: WBS3R9C52FK332509). Designed for high-revving track-day performance and daily driveability, the S55 twin-turbo inline-6 engine is at the heart of every F80 M3 and F82 M4 from 2015 to 2020.

This unit is sold as-is and ideal for rebuilders or engine swap enthusiasts. Compression and leak-down tests reveal possible valve timing and sealing issues, likely due to collision-related damage and loss of oil from a cracked pan. Cylinder 3 in particular shows elevated leakage (20 psi), with the engine exhibiting premature exhaust valve actuation.

Despite the condition, the block and cylinder head are intact and turn freely. This is a strong candidate for a performance rebuild or OEM-spec refresh.

Please note: Must ship to a commercial address. Additional charges apply for residential delivery. 90-day limited warranty included on the long block assembly.

Specifications:

• Engine Code: S55B30T0 (3.0L Twin-Turbocharged Inline-6)

• Fitment: 2015–2020 BMW F80 M3, F82 M4, F83 M4 Convertible

• Transmission: Dual-Clutch Transmission (DCT; not included)

• Original Vehicle: 2015 BMW M4 Coupe

• VIN: WBS3R9C52FK332509

• Exterior Color: Alpine White III (300)

• Interior Color: Carbonstructure Anthracite (CSAT)

• Mileage: Unknown (Donor had front-end collision)

• SKU: 33048

 Compression Test:

• Dry: 55 | 80 | 80 | 75 | 80 | 80

• Wet: 100 | 90 | 90 | 82 | 100 | 95

 Leakdown Test:

• Cylinder 1: 3 psi

• Cylinder 2: 3 psi

• Cylinder 3: 20 psi

Condition Notes:

• Bent valves suspected—possible timing issue from collision or oil loss.

• Engine turns, cylinder head and block not cracked.

• Ideal for rebuild or as a donor long block/core unit.

• Warranty limited to block and head integrity only.

Warranty Details (90 Days – Limited):

• Covers: Cylinder block and head (structural integrity only)

• Does NOT cover: Accessories, gaskets, seals, spark plugs, timing components, aluminum bolts, or external parts

• Installation must be performed by an ASE-certified shop or BMW dealership

• Oil starvation or overheating voids all coverage

• Labor and shipping are not covered under warranty

BMW Engine Subcategories:

1. S55 Long Block Engines

2. BMW M3/M4 Powertrain Assemblies

3. F80/F82/F83 Performance Engine Cores

4. Twin-Turbo Inline-6 Motors

5. BMW Engine Rebuild Units

6. M-Series Track-Ready Engines

7. DCT-Compatible Engine Assemblies

8. BMW S55 Replacement Motors

Why Choose the BMW S55 Engine?

The S55 engine is a motorsport-derived marvel, pushing over 400 hp in factory tune and engineered for both agility and endurance. This long block gives enthusiasts and professionals a foundation to build an OEM-restored or high-performance S55 application. From full tear-downs to forged rebuilds, this core opens the door to M-power customization.