https://drive.google.com/open?id=0B0...U9XX29vd1hGVTQ

I have a manual 2011 Honda fit sport with just over 63k miles. Recently it has been making this strange intermittent noise...

Sounds like a cross between a squirrel and a noisemaker. It makes the noise both in gear and in neutral; even when stationary as in the video.

I am not sure if it can be explained by something loose rattling, but it started after getting an oil change. You guys have helped me out so many times, I wonder if you know this sound...

 

Have you double checked the oil level? Is the sound more noticeable when you give it gas?
Sounds like a knocking noise, but aside from that noise the motor sounds ok.

 

Sounds like a knock for sure. That sucks.

I'd check the oil level at least and probably get the oil changed again. Wouldn't be suprised to see shiny metal flakes in the oil. Did you change the oil originally or get some sort of Jiffy Lube place to do it?

 

I took it to the Mart of Wals for the last oil change. Probably I shouldn't have done that, but the location had good reviews. The oil level is if anything slightly above the upper mark when hot. There are some horror stories of debris keeping oil out of one compartment. I'll double check the type of oil filter they put on.

I put a fuel injector cleaner in my last tank of gas just in case it's just one cylinder with a light mix.

Currently it's not making the noise at all! I do have an extended power-train warranty, so I want to take it in for service before that expires. The video is an extreme example, from before the fuel injection cleaner. I cannot illicit the noise by giving it more gas or by driving it around. I'm worried the dealer won't be able to diagnose if it's not an active problem.