Originally Posted by Spanner Juggler
Originally Posted by John V6
Thanks Colin, I never thought of that & my Roadster will never hold fluid to the max line.


Neither would my 2002 +8, I was having a good look and that’s when the penny dropped it was a LR header tank. One of my first meets with Peter Mulberry of Mulfab ended up with one of his header tanks and problem of loosing half the water from the OE was gone.

BR
Colin

I have the same issue with my 04 +8 and have come to the conclusion that when the system is full to the mark the OE expansion tank is not big enough to hold all the expanding coolant. So some coolant is lost. When the coolant is cold and contracted the tank is empty. So I would be interested to know if the Mulfab tank has a larger volume to handle the full range of expansion.