1994 S420 Engine Swap Upgrade
My ‘94 S420 finally tapped out on me yesterday, and I’m thinking it might be time for an upgrade instead of just a straight replacement. I’ve been looking into swapping in the 5.0L from a later model S500 or SL500, from what I’ve read, it’s supposedly a “direct” fit since they both run the M119.
Has anyone here actually done that swap before? How smooth was the process? Any surprises I should expect with wiring, ECU, or mounts? Just trying to get some real-world insight before I start hunting down a donor motor.
Appreciate any thoughts, feedback, or warnings y’all can throw my way.

7.3 Brabus motor for sale would be a good fit.


