Hi, I recently purchased a 1999 Discovery 2 Td5 with 134k on the clock but with full LR service history (last at 129k). Having now covered 1500mls it seems to be drinking a lot of water, at least a header tank full each day. It does not seem to overheat, not according to the temp gauge anyway, no apparent leaks etc. I am suspecting head gasket failure. If so any advice on doing this as a DIY project myself very welcome please.