The oil filler cap won't come off my Jeep TJ and ratchets in the wrong direction.
According to the Jeep Service guy I talked to, the stock ratcheting oil filler caps usually break ater about ten oil changes. I guess I'm lucky that mine lasted 15 oil changes. The spring is strong enough to provide enough outward force to keep the male teeth engaging with the lower cap. The plastic eventually bends and allows reverse ratcheting.
Procedure:
I just got a TSB letter in the mail today about the ODB light in my Jeep Wrangler.