Hi Guys, I switched to SSO 0w30 In My Mazda 3 2.3L ( Spec. Oil is 5w20 ) I Noticed after switch that my RPM's are lower at 100Km speed... Before needle was on 3K rpms. now Its under 3K rpms. you can see it with out problem ... Beside I have scangauge II .. Why is that ? I was running ASL 0w20 .. Didn't notice any difference! I was sure when I switch to 0w30 my rpm's would jump .