A small puddle of red fluid underneath your Mini indicates a transmission fluid leak. Well, it is not a good sign as it can cost a lot of money down the road, if it is not fixed at the right time. A small puncture in the transmission pan, broken output shaft seals, cracked fluid line, failing pan gasket- are the common reasons for transmission leak. Transmission fluid is a sensitive stuff of the car. So, if your Mini is leaking transmission fluid, then you should call a certified car mechanic and fix the issue straightaway to prolong your Mini’s longevity.