BenzUnited Parts
M278 Billet Polyurethane Engine Mounts – E550 / CLS550
M278 Billet Polyurethane Engine Mounts – E550 / CLS550
Couldn't load pickup availability
Billet / Polyurethane Engine Mounts for Mercedes M278 (W212 / W218)
Reduce drivetrain motion • Sharpen throttle response • Improve power delivery
Upgrade your Mercedes-Benz M278 4.7L BiTurbo with our Billet / Polyurethane Engine Mounts. Designed specifically for the W212 E 550 and W218 CLS 550, these mounts deliver superior engine control, sharper response, and consistent power transfer under load — ideal for tuned or spiritedly driven 550 builds.
Factory fluid-filled mounts on M278 cars sag, leak, and collapse with age, especially on tuned cars or those driven hard. The result is excess engine movement, sloppy shifts, and vibration under throttle. These billet/poly mounts eliminate that failure point with a rigid housing and high-durometer insert that keep everything locked in place.
⚙️ Key Benefits
- Stability & Control: Reduces engine movement and drivetrain lash for sharper throttle response and cleaner shifts.
- Durable by Design: Billet aluminum housings and high-durometer polyurethane resist heat, oil, and deformation far better than OEM fluid-filled mounts.
- Improved Torque Transfer: Keeps the drivetrain aligned under boost so more of the M278’s torque reaches the rear wheels.
- Consistent Geometry: Prevents the front end from “sagging” as mounts age, helping maintain proper driveline and exhaust alignment.
- Direct-Fit Upgrade: Engineered around factory mount geometry for a precise, bolt-in installation.
✅ Vehicle Fitment — M278 (W212 / W218)
| Model | Engine | Years |
|---|---|---|
| E 550 (W212) | M278 4.7L BiTurbo | 2012–2016 |
| CLS 550 (W218) | M278 4.7L BiTurbo | 2012–2018 |
Fitment is exclusive to the W212 and W218 M278 platforms. Contact us with your VIN if you’re unsure.
📦 What’s Included & Install Notes
- Left + Right Billet / Polyurethane Engine Mounts for M278 W212/W218.
- Reuse the OEM top cap (pops off the factory mount with a small screwdriver).
- Direct-fit design matches factory geometry for proper drivetrain and exhaust alignment.
Professional installation recommended. Torque all fasteners to factory specification and verify downpipe, subframe, and steering rack clearance after installation.
❓ Frequently Asked Questions
Will these increase NVH?
Compared to soft OEM fluid-filled mounts, you may notice a slight increase in vibration at idle or low RPM. Under load, most drivers prefer the added precision, improved drivetrain feel, and reduction in “slop” when getting on and off throttle.
Are these mounts suitable for tuned or high-boost M278 cars?
Yes. The billet housings and high-durometer polyurethane inserts are designed to handle the elevated torque, heat, and repeated load cycles typical of tuned W212/W218 M278 builds.
Do I need new hardware?
OEM hardware may be reused if it’s in good condition. Replace any stretched, corroded, or damaged bolts and always follow factory torque and angle specs.
Performance engine mounts for Mercedes E 550 & CLS 550 — W212 / W218 M278 4.7L BiTurbo.
