Hello All, I've owned a Roadsport with the 140 upgrade for 2 years and throughout this time its has been losing a small amount of coolant - about a third of a pint every 500 miles. 7s&Cs pressure tested the system and pronounced it ok. There is no trace of water in the oil or oil in the water. There is no obvious leak and I am mystified! Has anyone else experienced this or got any ideas? Thanks