I have a 2006 Jeep Wrangler with a 4.0 in it that I just bought a month ago. I discovered the valve cover gasket is leaking oil but was wondering if I have to change the oil after I replace the gasket or not is this general practice or not. The guy that I bought it from told me that it has expensive amsoil in it which only has about 2,000 miles on the oil.this is the reason I asked the question because I don't know if I should just wait a while then do it change the oil or would I be okay to just change the gasket and be careful not to get anything down by the valves. Thank you