4 sec knocking after oil change

[Eggman]

I usually hear a rattle for a few seconds after an oil change. Some cars do it longer/louder than others. I wouldn't loose too much sleep over it.

+1.

Here is a fine example of the shortcomings of troubleshooting over the Internet - without the use of audio or video, what can we do?

Hopefully it's no big deal. Send in a sample for analysis at your next change and you'll know if it's anything to worry about.

Looking forward to seeing your updates on this.