INDYMAC, Grandad used to have a foot locker full of used spark plugs, just in case something (like the depression) came along again, and his saved ones were better than the ones in his truck.
Parents r16 called for 5,000KM oci, and 10k filer changes. Thats what I did.
Now that using synths, it's 10k for both.
age 42.
BTW, I pulled apart some of those renault filters back in the day, and they were extremely robust pressed steel, even pleats etc. like they were designed to go the distance.