Way back in 1968 I talked to a salesman who traveled over fifty thousand miles a year, he was driving an American Motors Ambassador with a V-8. He said he would only drive American Motors cars and he swore that he NEVER changed oil, just changed the filter regularly and added a quart to replace the oil lost when changing the filter and any other time when the dipstick dropped to the add mark. He claimed to be driving his cars 200,000 miles before trading. He had some crazy theory that new oil was no good for an engine.
I have long known that highway miles are much less wearing on an engine than city driving and that is probably what saved this guy from blowing an engine every six months.
My son in law drives a 72 Nash Ambasssaror with a warmed over V/8 and 5 spoke “mags”. I call it a Nash to piss him off. He is a 25+ year journeyman auto mechanic and has some other “unusual” cars like his Dads completely stock 1932 Ford 5 window coupe with the original 4 banger in it. His Dad bought it the 50s. His Dad drives a stock 1935 Ford 4 door that he restored a couple of years ago...