I have two issues. I have an oil leak. I recently had the timing belt, water pump changed and had a leak prior. But, still seem to be having it. I thought I had an alignment problem because tires wore unevenly on the inside. So I bought I new tires, and had an alignment. I still feel vibration on highway. Really want this problem fixed as I don't want to ruin another set of tires. What could be causing uneven tire wear and vibration?

 

Not sure about the alignment problem, but the oil leak could be your valve gaskets or cam gear is leaking oil, I had a leak from both.