yeah I see that. lube would get a big need, but my car runs out of gas several times before I need an oil change and retail stores do carry oil. ironically canola oil and vegetable oil can be used as motor oil. when you run out of oil then things start to grind to a stop.

but machinery would become too costly to maintain and people would stop using it. if a valve broke on a engine I doubt people in the post apocalypses would repair it. unless it was part of a town where people would have both the need and expertise to fix it. there would be easier to maintain alternative of machines that wouldn't require lube, filters, replacing of metal parts.

after a century an internal combustion engine would become unusable scrape