Chevron Delo 15W40 - new cars, old cars, motorcycle, yard equipment, stand-by generator and anything else with a 4-stroke engine, year round. Filters, generic el cheapos. Change interval once/year.150 K on both daily drivers, no oil use, no signs of wear in any.
KISS
Years ago I had a friend who bought a new Chevy truck. He never changed the oil. Last I knew it had 50K miles and was still running just fine, using a quart evey 2K miles or so. How long it ran I dunno.
I now do once a year on our Caddy (SBC) and V70 Volvo turbo. That's about 10-12K miles each...