144,000 miles, stock, oil changed regularly. I took the utmost care of this car and one day the radiator blew out, so I thought... Took it to my local subaru dealership to have it replaced and checked out, as it got fairly hot and I wanted it thoroughly checked out before I drove it again. I get the car back with only a radiator replacement and the word that everything was ok. A month later same thing happens, or at least it looked/seemed like it, but it never got hot. On this day I was late for work and put regular old tap water in it (I know this is frowned upon). Drove for a little bit, checked it, no problems, sounds fine, then went the rest of the way to work, no over heating. After work I had to put a little more water in it to get it to the dealership that had serviced it before. On the way over, everything seemes fine, until I get about 500 yards from the shop when my oil light comes on and the power steering seems to get weak. I park it ASAP, it's smoking, just beginning to show a rise in temp at the guage. At this point I'm the one steaming over this dealership's mechanic who told me everything was fine, so I leave without opening the hood as I see it as being their problem now and I won't have to pay a thing out of pocket. Nope. When they get back to me they tell me that the head gasket is blown and that it's not thier fault because they say I told them not to do a diagnostic on it the first time, as I "knew" it was the radiator and that's all that I wanted changed. I guess the explaination as to why I brought it there in the first place (these being the only "certified" subaru mechanics in my area), was not enough for them to pressure test the system. Anyway, they are trying to tell me that it needs a new motor due to this blown gasket. They priced a used one with 130,000 mi for $3,500, but that's not an option. So, my question is, if all that is wrong with this is the head gasket, do you guys think it can be changed by this shade tree mechanic (me) that will do the research, properly install it and probably have it tuned by someone with a real knowledge? P.S. I won't be doing it under a tree... Thanks to any reply's in advance! I need the help.