Originally Posted by LantanaTX

I am sorry if you thought I was disagreeing with you. I agree, but forget that many people don't work on their own cars. Since he said knocking and not tapping I thought he may have a mechanical issue and the old screw driver to the ear is an easy way to find it and is free if you can do this. I don't agree that oil is oil or at least not for very long if you want your engine to last a long time.

I have only one use for dino oil and that is in a brand new engine. In a brand new engine synthetic is almost too good and it can take a long time for the rings to seat. Using dino oil for the first few hundred miles helps with engine break in and as soon as you no longer see any engine smoke from the exhaust it is time to put in the good stuff.