for the last 4 oil changes in my truck ford 4.6 i have used nothing but blended oils,the latest mobil 7500 wich im getting ready to send it for uoa(my first one). but anyways went to walmart and couldnot find the 7500 blend and i saw pennzoil on sale so, thats what i have for my next oil change,by using this oil im i taking a step backwards or is it a good choice(regular pennzoil yellow label). my other big question is if i should be running a 10w30 since its getting hotter now (90's) i would like to but its a big no-no for ford,thats why i stay in the middle 5w30 couse im really not a fan of 5w20 oils,well tks for your comments
