And the lesson here is?
And the lesson here is?
Pretty much for a car driven within the normal range (a pretty wide range) oil is oil. You can put lipstick on the oil can and charge $16 a quart or $3.50 a quart. If you change the oil at reasonable intervals, you'll never notice the difference except in your wallet. (and if you are driving a contour, either you are a stingy person like me, poor, or ??????????) Now those folks who try to rationalize that the syn oils allow much longer changes, it depends. If you drive long distances and are able to get the car to operating temp, then probably. But over 4x miles between changes? As for people like me who live in a small town, short hops, rarely at operating temps, the no more than 5 K and that is to flush out the water and acids that are not burned off as long distance driving will do.