Scotty love the videos! On a 2014 toyota prius what does it mean if on the end of the dipstick there is yellow stuff with some black in it, almost like sludge. The oil and filter were “changed” by a dealership every 5k miles, but the oil was a shade of yellow that was a lot darker than I think it should be considering it was changed less then 1000 miles ago. The car has 61k miles on it now. What do you think about this?