Transparent 300Tdi coolant reservoir header tanks

There is a rumour on the internet that the original 300Tdi coolant header tanks (ESR63) have a habit of splitting around the seam. Maybe this happened to a few people but is unrelated to the fact they are black. The later type of header tank is translucent (PCF101590). The main benefit of this is that you can see the coolant level without having to open the cap. That's why I fitted one!