There's a known issue with these - they leak around the plastic seam in the middle of the bottle. I'm on my fourth now and they seem to be getting worse. First one lasted for 3+ years, was changed by local dealer, then RT Mechanics changed one at 84,000 service and the new one had gone again at the 96,000 service (last one replaced under warranty as less than a year old). Always a chance it's just a loose pipe but given my history I'd put money on it being the bottle itself - not enough money to replace it mind you :) Tony