BMW E24 635CSI
✅ Complete · 2021

BMW
E24 635CSI

A 1989 BMW E24 635CSi covered in rust — chassis rails eaten through, botched fibreglass repairs, and an engine mystery nobody could solve. Mat replaced the ECU, fixed it, and started a full restoration.

1989
Year
3.5L M30 I6
Engine
Massive Rust
Challenge
The Build Story

The BMW E24 635CSi was Mat's first classic car project — a 1989 model that had been passed between multiple owners who all failed to fix its mysterious engine problems. Mat eventually solved the issue by replacing the ECU, which finally brought the 3.5L M30 inline-six back to life.

The real challenge was the bodywork. The car was riddled with rust — chassis rails eaten through and held together only by undercoating, sills destroyed, rear quarters rotted, floor pan compromised, and botched fibreglass repairs covering terrible paintwork underneath. The restoration required cutting away damaged sections and welding new metal, with plans for a manual transmission swap from an E12 5 Series to replace the original 4-speed automatic.

Playlist

▶ Full BMW E24 635CSI rebuild playlist on YouTube.



▶ Watch on YouTube
Gallery
Build Finances
Purchase PriceTBD
Parts & RepairsTBD
Total InvestedTBD