Hey guys! I recently had my SES light come on with codes P0014 and P1815. I have a 2008 Infiniti G35x and I bought it used about 3 months ago. It runs very smoothly with no issues. When I took it to my mechanic he noticed sludge from the tip of where the oil goes. He told me this might be the issue and recommended an oil flush. After going online and reading oil flush reviews now im scared it might mess up my engine. What should I do here?