Have a quick question about oil. I have a 2001 Explorer Sport and I was talking to a mechanic who thinks that 5W-30 doesnt offer enough protection and that I should use 10W-30 instead. I am in Houston and it rarely goes below frezeing and for the most part the temp is around 80 degress anyway so I dont think I even hit the 5W. I was wondering if anyone else is usein 10W-30.