But admit it, you were adding a quart every 1000 miles or so. It simply isn't possible, even with the best oil for there to be ANY oil left in the crankcase after 65k miles. It will break down and boil off.
Not much at all. Maybe a few quarts the life of the car. I only sold it because the heater core, tie rods and brakes needed repair all at the same time. I couldn’t see putting more $ in repairs that the car was worth.
When I had a mechanic change the oil at 65K during NYS Safety Inspection and asked him if the oil looked right. He said it looked normal. When I told him how old it was, his jaw dropped.
Meanwhile a guy I worked with at the time bought the same model and new was going through a quart every 750 miles. He was not happy when the dealer told him it was normal. Fortunately that dealer is now out of business.