Mine looks the EXACT same! I really want to know why too. It almost has to be the plastic deteriorating. Mine has never sat out enough for anything to chew on it.
That usually happens to oil filler caps if they have been placed on top of the battery and contaminated with battery acid. Can happen with the semi-sealed OE batteries or more so with the conventional top batteries.__________________
copied from above link
Good to know. My Dads cap on this 7.3 and 6.0 both look like this yet mine looks fine. I was actually just wondering what causes that about a month ago.
I changed the oil myself for the first time yesterday (usually just take it in to the Ford dealer quick lane for them to do it) and noticed my cap was starting to look like the OP's (but not quite as bad). And sure as ****, not even thinking about it I laid the cap on the battery but moved it a few minutes later to my tool box. I'm definitely going to be more aware of this from now on.
I doubt it is the battery. Battery cases are plastic.
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