My wife has an '01 Pontiac Aztek with 105k miles. She has been getting her oil changed at whatever place she could find a coupon for. Since I have purchased a new truck, and am back to doing my own OC's again.....she's wondering why I don't change hers? So, I could use some advice as to what oil to use. I took off the oil filler cap and looked into the rocker cover with a flashlight....it's pretty dirty in there. I'm thinking something with a good detergent maybe? Any advantage to going with a "high mileage" oil? I picked up a few wix filters too. Thanks!