You can't just stick any old dipstick in and expect it to be accurate, Ford made numerous depth
oil pans and the corresponding correct dipstick for each..I have no less than 6 Ford factory dipsticks and they are all different lengths,by as much as 2 inches...if you do not know where the
oil level should be or how deep the dipstick is in the block,do not use the marks on the dipstick, your just guessing..........
David