 like maybe you start it and you drive it a couple blocks and park it you just or start to move around the garage they might be starting to follow where it's time to change it but it's an o2 i mean we're talking 20 years old 23 years old it's definitely not going to hurt to change them just for age on the other hand i have spark plugs in a model t that were put in in 1975 that are still perfect there's no reason to change them i'm not going to the electrodes not burnt they're