I just found out my 2004 Frontier has developed a leak in the head gasket. It has 144,000 miles on it, and I bought it for 6100 last April. Any of you had a similar situation, and is it worth spending the $2,000 to fix it? My other options I'm thinking is just putting some Bar's Leak into it and driving it until it blows, or selling it/trading it in for basically nothing. Any advice?