We really didn't know this hidden corrosion was present in the Rear Sills and Rear Jacking Points of this BMW (E39) M5!

This is a Nov 2002 BMW E39 M5 with 124,000 miles.

The corrosion was well hidden behind OEM factory seam sealer meaning that until you started pressing and poking certain sections you wouldn't believe how 'holed' it was.

We were stunned when the Right Rear 'Sill End' gave way with just thumb pressure!

As you can see, initially this M5 didn't look too bad but once it was stripped and we dug deeper we found a surprising amount of corrosion.

We were tasked with carrying out a tidy-up process on the underside rear chassis as the owner knew there was some corrosion present.

The giveaway on this vehicle was that corrosion was already present on the outer rear sill sections which means it's been growing for several years as it all starts from the inside first.

Both the Fuel System and the Rear Axle System (and all their ancillaries) were disassembled for access and correct assessment of the problem areas.

The Rear Sills and Rear Jacking Points were a major problem on this vehicle (as with most E39's), as well as the Fuel Tank Bracketry, the RACP Mounting Points, and the Boot Floor Curved Panel.

Watch us talk through the process and update you on the key stages of the repairs necessary to restore this BMW E39 M5 Rear Chassis and improve upon it's weather protection processes.

This work took 114 hours.

For more BMW E39 M5 content check our website here:
http://www.redish-motorsport.com/E39M...

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