Lately whenever I start my jeep I get a noise that, after reading many posts, may be the notorious engine dry-start knock. It starts about 1-2 seconds after I start the cold engine in the morning. It lasts less than a second then I never hear it again that day. It is not loud at all, with the doors closed and soft top up I can barely even hear it. It soulds like a high pitched ratteling sound.
I tried changing the oil filter to a Fram Tough guard from the purolator and added STP oil treatment and it made no difference. I am using Mobil 1 5w20 oil.
Can anyone with experience with this please give their opinion?