Hello,
I am in the process of replacing the Silicone seal on my oil pain, and when I took the pain off, these pieces of plastic were sitting in the pain. I have not ever seen any pieces in the oil I have drained before and I use a small funnel to pour the oil into the waste can, so chunks bigger than 3/8 of an inch should get stuck in the funnel.
Any thoughts? Guides for the Chains on the Rear of the engine comes to my mind. Sounds like an expensive fix.
Mike