Thanks for the video that's helpful information. I didn't have any luck finding it with my fiber optic camera or attempting to fish it blindly. I'm starting to wonder if it really fell where I think it did but I don't see it anywhere else and it didn't come out on the oil filter shaft when removed from housing.
Thanks for the additional information. This happened because I wasn't paying attention and returned the oil filter to the housing without the nut at the bottom of the assembly. I realized my mistake after putting the filter back in. I then removed the oil filter and the oring the bottom that goes above the nut was gone. It was a loose fit so I assume it came off and fell in that gap. I used a fiber optic camera and can see quite a bit with it but don't see it in there. I tried fishing and a small vacuum tool but can't find anything.
Thanks for this diagram. To clarify the O-ring was on the bottom ledge on part 25 (bolt) in this photo. It doesn't show one in this diagram so perhaps there never was supposed to be one there in the first place. I can say it was there after the dealer services it so when I attempted to change the oil myself I replaced it not knowing it appears to not be part of the assembly.
Erick
It's been sitting at the dealer for a week waiting to be looked at. Unfortunately they don't make appointments but require dropping it off then estimated a 1-2 week wait before they can get to it. I'll let you know what I hear back hopefully in the next week.
Side note, this was my mistake no doubt. It does however lead me to think a metal screen or some other easy way to access this area would be beneficial in future designs of the oil filter housing.
Erick
I'm not really sure how it works which is why I thought going to the dealership to fix the mistake was a good idea. I'm questioning my decision as my trailer came back with a broken fender guard I discovered before I took off. They indicated they'd order a replacement. One problem to another I'm afraid.
