Every times I pass an even thousand miles at next fill up.’My MDX with 180k uses about 1 qt every 5k miles and our wife new 2018 Tiguan no idea where the dipstick is. (800 miles).
My wife’s previous 2005 Subaru with 250k was every two weeks adding 1/2 quart.
Yep, it needs to be relevant to the vehicles age and condition and how well you know it.
Work vans? Every fill up when older, a lot when brand new, then seldom when still fresh.
Sig car? Regularly before startup.
Wife's RAM? Every week or so...