Scotty! Im totally confused with looking at my dads nissan owners manual and my honda owners manual coz i reviewed it last night and we both have subcompact sedans.. But nissan manual states use 5w30 oil when it is upto 30 degrees C only and above it use 5w40 oil.. But why the hell is my honda manual telling that 5w30 oil is upto 36-40 degrees C.. Our temp here runs 35 degrees above and its hot.. Should honda engineers consider 5w40 or something? Why is it that they are using 30 weight oil despite nissan and others maybe are using 40 weight oil? Im confused?
stick to what they suggest, both of them. Engineers have different engine designs and honda knows more about engines than nissan anyway