Welcome to 2CarPros.
What services were done by the first shop? Also, can you record the noise and upload it for me to hear? A knock or rattle can be multiple things, but I'm not sure why an oil change would have made it worse. I need to hear it.
Now, take a look through this link. It discusses different conditions that can cause engine knocking. See if there is anything that seems to mirror what you hear.
https://www.2carpros.com/articles/engine-noises
Let me know.
Take care,
Joe
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Friday, June 21st, 2019 AT 10:36 PM