My 300SD with 351K miles on it, must have done some injector knocking. I was sitting at a traffic light waiting for the Green, when I started hearing a knocking sound. It sounded like bearings, whether it be mains or rod???

I panicked, my baby can't do this to me yet!!!

Well, I figured I'll be parting her out soon because of this strange unwanted sound emminating from the engine compartment. Seemed like from the bottom area of the engine.

I drove the car anyways. After about 2-3 miles, the sound stopped just as quickly as it started.

Question, is it even remotely possible for bearing knock to go away? I did add a quart of oil because it was a quart low on oil, and ummmmm, I can't remember when the oil was changed last, it's got some blowby and I just keep adding oil as needed, so I figure all the oil isn't that old.

So I figure a piece of french fry might have gotten lodged in one injector and the car needed a hind lick manuever.