Scotty...did my routine oil change yesterday on the 2010 Corolla. Using Pennzoil platinum full synthetic. As I loosened the oil canister....I noticed a milky looking substance in the canister threads. Any idea what the heck it coulda been? First time I have ever seen this.

that can be water in the oil. Try this video https://www.youtube.com/watch?v=QA7KVQq9vKA&t=55s