Just bought a used 2007 mazda cx-7. It has a turbo engine. It has always had Mobil 1 5w30 used in it. It has 30,000 miles Should I stick with this oil? Been thinking about trying schaeffers 9000 5-30w. I have been reading a lot of old posts but still needed the advise. Also thought I would try the neutra in the gas. Thanks for the advise