Better late than never:)

Attatched is 2 photos of an S54 failed headgasket. It always fails between the cylinders, and for whatever reason its always between 1 & 2, and 5 & 6 that fail first.

Bizarely on CSL's they seem to fail between the other cylinders as well, where as standard M3's just seem to go between those end cylinders (In my experience, this may not be the case across the board).

Csl tend to see tracks more, so likely a contributory factor.

For those with technical knowledge, how does not warming up the engine properly/cool down affect not only the head gasket but other parts too?

The expansion and retraction of different materials at different temperatures. This creates a situation where two different materials expand at different temps and end up rubbing against each other (very simplistic explanation) Driving the car hard when cold places even more stress on those "tight" "cold" components.

If they are both up to operating temps theyll both be at their largest and will operate as designed with correct tolerances.

Thanks, but what components will suffer the worst?

Your wallet if you don't have warranty :hahaha::hahaha::hahaha:

That's why I take extra care of my Cesil.