Mercedes Benz 300SL (1990s) M104 3.0 Petrol Engine and 5spd Manual DOG LEG Gearbox

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Mercedes Benz 300SL Engine and Manual Gearbox

M104 3.0 inline 6 cylinder petrol engine 24-valve DOHC with 717 5 speed manual dog-leg gearbox.

We bought two of these Mercedes Benz engines and matching gearboxes from a very well known international oil producer in the 90s. The engines were originally purchased directly from Mercedes in crates. They were to be used as test engines and gearboxes for proof testing oil. The first engine, we sold soon after acquiring. It had been used for testing for a short while and then sold to us. This engine that we have for sale here was a surplus engine designated for oil proof testing that was prepared, but we believe was never used. It has testing related fittings and pipes installed but we believe this engine and gearbox to have never been run and it has certainly never been in a vehicle. You will definitely need to perform a major service and remedial work to replace the pipework, belts, electrics, and maybe more too.

This listing also includes a stand-alone independent ECU that was to be used for the testing process while on a bench. See photos.

The engine is a 3.0 inline 6 cylinder M104 (981) built for a 300SL-24. It’s a 24valve DOHC. Mercedes used the M104 engines in the W124 300E, C124 300CE, S124 300TE and 300SL R129s.  The gearbox is a 717 (.451) 5 speed manual dog leg first gearbox. These were not fit to many vehicles and are becoming increasingly hard to find in any condition. We are potentially open to splitting the gearbox and engine up, given the right offer.

Due to the nature of this unique listing, we highly suggest a viewing in person.