I had a friend mechanic in another state look at my car thouroghly and told me I have a head gasket leak, and that my motor mounts are worn out and that's the reason it vibrates so bad with a/c on. This car is great running, doesn't burn oil but leaks oil bad. Should I redo the head when I change the head gasket? What other things should I consider when getting this type of work done. I already paid a shop to redo the rear main seal and they overfilled the oil which I believe was a signifacant factor in the accelerating this oil leak. It leaks a lot more oil, about a qt per 2k miles. I have not been driving it a lot due that I have a company vehicle. When I start it after a week it starts a little rough for a few seconds. Any advice is appreciated, thanks!

It may be a head gasket oil leak, but I'd check out the valve cover gasket first. Motor mounts would cause the kind of vibration you're talking about. How many miles on this engine?

180k, great running, I change the oil every 2-3k, coolant every 2 years and trans fluid every year... thanks