I have an ED 6 cylinder. Last couple of weeks have noticed dry coolant on the flat section under No 1 spark plug on the head. Thought nothing of it, just figured was spilt last time i flushed radiator. One day i scraped it off. Look the next day and there is a small puddle of wet coolant again. Cleaned it, drove for 10 minutes and looked again. It appears there is a small fracture about 2mm long and coolant is 'seeping' out of there. I think the head may have gone porus and the coolant is soaking through the alloy?? Any one here or see anything like this. I have had the head reco'd about 3 years ago with hardened valves for gas, new valves, guides ect thinking the head would last another 500,000kms but obviously i was wrong?!?