Ok so I am looking for some insight to my problem. I have a 2006 chevy malibu 2.2 Eco I changed my valve cover gasket about 4 months ago and everything was very clean keep in mind I have 390000 miles on this engine yesterday it started ticking real bad so I pulled over and checked my oil and it was fine no problem perfect level and still clean so I went on driving the tick then got very loud so I pulled over checked again with nothing wrong so I decided to be on the safe side and tow it home when I got it home I pulled the valve cover and found a very burnt and grimey too end so my question here is what happened and what could have caused it I believe an oil passage has gotten clogged any ideas