You really have to adhere to OEM oils in new cars. The tolerances are much tighter now and they need that 5W initially to circulate as fast as possible. I can be done but I wouldn't do it for nothing.Excellent. My buddy's dad works at a shop (They do lawnmowers and boat engines too) and gets excess for free and then does a custom blend and gives it to me. It's a blend of 5 different single weight oils. It's better in all temperatures that way.