I guess sometimes its worth to get your hands dirty and have a look for yourself on the very aspect such as oil in your cac like many have performed,after seeing oil inside leads me to believe preventative maintenance is in order,that map sensor before the tb is so vulnerable to oil and dirt,would grab a can of maf cleaner every oil change and actually clean both of them,especially being so simple such as removing a few screws,so if your experiencing any hestation that will be a good easy place to start.Z