mine has a small leak right now. not too bad. about a qt every 1500-2000 miles. I'm doing the timing belt and water pump soon so I figure im already halfway there. anyone rate it on a scale of 1 to 10, with 1 changeing a flat and 10 a total rebuild. I've got the Helms, so I'm not fumbling around in the dark, but still it seems like a fairly major thing.