hi there. i need some advice. i have a disco2 td5. 2000 plate. 2 months ago i replaced my head gasket due to water system pressure, ever since then she has been running spot on! until! yesterday. my drive to work is 8 miles or so. so i drove to work as normal no problems at all, got back to the yard 10 hrs later and one of the lads comes running over to me. dave your landy is bleeding to death. so i go and have a look, and yes there is about 2litres off engine oil on the concrete pad. so i lifted the bonnet dipped the oil and there was tiny bit on the tip of dip stick? next i checked the water in the expansion tank. hey presto!! ive found my engine oil. ive never had to use the dip stick in the expansion before. i dont know where to start. any ideas would be brilliant.