I have a 2006 F150 that had a bad oil leak twice that the dealership was suppose to have fixed, that was several months ago. Last week I went to start the truck up and there was a very loud knock in the engine, so I immediately shut it off. I know if I have it towed to the dealership they will tell me it wasn't anything that they did. Do you have any clue what could have happened? Thanks.

If you oil level is to low for the oil pump to pick up, then you may have bent a push rod causeing a knoking check oil level is ok then you could have still bent a rod

I would believe the dealer techs do not go to work to
damage your vehicle

I have never gone to any dealer in nearly 50 years,
after the warrantee runs out,too expensive

I would guess that the oil leak, is such that it would
require too much work to resolve,so they want to
distance themselves from it.