I cheat! Brother-In-Law has a mobil oil change shop. I buy my synthetic from him for a really low price. My cost per gallon is well below what most pay for a quart. Last go round oil and filters for 2 cars, 4 trucks F250, F350, C2500, ram3500 hemi and 2 riding lawnmowers and a rototiller was less than $100.

I was whining about 10 dollar a gallon oil and he made the offer, havent turned back since and if I need to change in winter, I just go there and do it.