Dipstick for MINI Cooper S R53 and R52, part number 11 43 7 509 784

Manufactured by Uro Parts

The R53 dipstick is prone to break.  Usually a tired dipstick shows signs of cracking along the shaft.  That sounds uncomfortable but nowhere near as uncomfortable as ignoring the warning signs and realising that most of the dipstick has stayed behind in the engine.

Best advice is to replace before you have a crisis.