hi,
is it ok if sometimes we used Fully/S oil, sometimes we use Semi/S oil? does it harmful to our engine? can we mix engine oil of different brands but same viscosity for our car engine? For 2007 2400cc sedan car, 10w/30 SS or 10w/40 SS oil better ??

This post has been edited by jason1818: Mar 6 2012, 07:25 PM