Hey all,

About 6 months ago I picked up this really beautiful 350SDL with 190K. I've been daily driving it without any issue since. We're at about 204K now.

Recently there's been a 'rumbling' coming from what seems to be the front of the engine. It's only apparent at idle, slightly raising the engine speed seems to make it go away. It behaves sort of like a bent catalytic converter. (It's not). The car does use some oil, but when I had the belly pan off earlier today to change the oil, I was (sort of) relieved to see that it's been leaking, and not necessarily consuming it.

I read some things about fuel 'nailing'. There's also a 'tick' coming from the top side of the engine, which I have read could indicate a bad injector.

I've taken a video to try to point out the sound. The car runs beautifully and idles smooth. This noise is starting to bug me. Any thoughts are appreciated.

https://youtu.be/_2sHX-dPBUA