Spark plug and oil filter

[Easy Rider]

Originally Posted by 5th_bike

next time it's just going to be a filter.

It's a time kind of thing more than mileage.

Eventually, the "rubber" will keep it's new, compressed shape and won't seal as good (or at all) when removed and replaced.

The safest thing to do is replace it every time. If, however, you closely inspect them for damage, I see no reason they can't have a useful life of about 2X oil changes.

I always have a set on hand; inspect and re-use once and then change the next time.