IMHO. If at 75,000 miles your engine is tired, it has either been abused/not properly maintained, or it was a POS engine to begin with, like maybe a Fiat or something.
I let my oil change get away from me on my 220,000 mile 300E and it went to 5,000 miles before I drained it. Before I drained it I checked the oil and it had not gone down on the dip stick AT ALL!
Due to improving engine construction and design technology, fuel injection AND better engine oils, 75,000 miles is the breakin point as far as I'm concerned.
Have a great day,