- Mercedes SL Class 221 Type S550 Awd 2012
2012 Mercedes S Class Used Engine — S550, AWD, 221 chassis
4.5 on Trustpilot · 335 reviewsHow ordering works
- 1Enter or confirm your VIN
- 2We verify exact fitment for your vehicle
- 3Flat freight shown up front — no surprises
- 490-day warranty included on every part
- 5We photograph & confirm the unit before it ships
What's included with this engine
You're buying a complete engine assembly — not a bare block. Here's exactly what arrives bolted to it, and the handful of accessories your mechanic moves over from your current engine during the install.
Included with your engine
Already assembled — ships as one unit- Long block — fully assembled
- Short block
- Cylinder head
- Crankshaft
- Camshaft
- Pistons
- Intake manifold
- Exhaust manifold
- Oil pan
- Timing cover
Not included — transfer these over
Reused from your current engine- Wiring harness
- Bolt-on accessories
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About this part
OEM Mercedes SL550 4.7L Biturbo V8 Engine 2012 R231 Chassis
This complete M278 engine replacement is specifically designed for the 2012 Mercedes SL Class 221 S550 AWD models, ensuring full compatibility and factory-level performance.
Engine Specifications:
| Category | Details |
|---|---|
| Engine Code | M278 DE 46 AL |
| Displacement | 4.7L Biturbo V8 |
| Horsepower | 429 HP |
| Torque | 516 lb-ft |
| Turbochargers | Twin BorgWarner EFR7163 |
| Fuel System | Direct Injection |
| Block Material | Aluminium block/heads |
| Transmission | 7G-Tronic Plus compatible |
Key Features:
Complete Long Block Assembly: Includes the fully assembled engine block, crankshaft, pistons, cylinder head, and valvetrain.
Includes Intake & Exhaust Manifolds: Comes with both manifolds pre-attached, saving installation time.
Backed by Warranty: Provides a reliable warranty on the entire assembly for peace of mind.
Pricing Options:
| Mileage Range | Price | Condition |
|---|---|---|
| 30K-60K miles | $ 7,475.00 | Low-mileage, full history |
| 60K-90K miles | $ 6,817.20 | Excellent, minor wear |
| 90K-120K miles | $ 6,493.50 | Good, may need gaskets |
| 120K-150K miles | $ 6,318.00 | Functional, needs timing service |
Shipping Information:
Dimensions: Length 48"× Width 36"× Height 38"
Weight: 580 lbs
Shipping Options:
Standard shipping 5-7 business days
Expedited shipping are available for an extra charge
Frequently Asked Questions?
Q: Do your engines have warranties?
A: We provide a standard 60-day warranty on all parts, with an option for an extended 6-12 month warranty upon request. Contact our customer care for details.
Q: Will this work in my 2013 SL550?
A: This 2012 Mercedes SL Class 221 Type S550 AWD engine is engineered for precision and power, making it a perfect fit for your 2013 SL550. Experience a seamless upgrade designed to unlock your vehicle’s true potential and keep you dominating the road with confidence.
Q: How to verify my engine code?
A: To verify the engine code for your 2012 Mercedes SL Class 221 S550 AWD, locate the engine identification number stamped on the engine block
Ready to Order?
Ideal for professional replacement, this engine helps maintain your Mercedes’ high standards of driving precision and longevity.
Tested, VIN-matched, and guaranteed
VIN-Verified Fit
We match the part to your vehicle's VIN and confirm exact fitment before we ship — so it fits the first time. Free cancellation within 24 hours.
Works on Arrival, Guaranteed
Every unit is tested before it ships. If it arrives defective, we replace it fast — and in the rare case we can't replace it, you get a full refund.
90-Day Warranty
A real parts-replacement warranty, included — with extended coverage available.
Heavy freight item, shipped fully insured and tracked. Freight is a flat $250 commercial / $400 residential, shown at checkout — no hidden fees, no freight-quote runaround.
Want a better price on this part?
Call us before you order — we’ll check if there’s an extra discount available on this exact part for your vehicle. Two minutes, no pressure.
☎ Call (206) 686-6866Ask us about a better price
One quick call and we’ll see if we can get you a better discount on this part. Real specialist, no call center.
☎ Call (206) 686-6866