Jason; Until you find out the cause of that knock, DO NOT RUN THAT ENGINE. If the knocking only just started there is a chance that very little damage was done if you only ran it briefly. Are you absolutely sure that the noise came from the valve train and not the crank case? If it's from the valve train you may only have a sticky lifter. If it's from the crank case you have a bad con rod bearing which, if no damage was done to the jounals, may only amount to replace the set. If some damage was done to the journals you will need to have that crankshaft reground to the next undersize. In any scenario you will need to open up that engine to investigate and solve the problem. If it's any consulation the oil additive only brought a problem to the forefront that was probably due to occur at some point anyhow. I don't know how old your car is but if it is more then thirty years old I think that if you need to tear it down I would have the block dipped and the passages cleaned out while you are at it. Best Regards Arran Foster 1954 Imperial Newport Needing a Left Side Taillight Bezel and other trim parts. ----- Original Message ----- From: "Jason Slaten" <jasonslaten@xxxxxxxxxxx> To: <vm.dude@xxxxxxxxxxx>; <mailing-list@xxxxxxxxxxxxxxxx> Sent: Friday, January 11, 2002 8:38 AM Subject: IML: I DID SOMETHING VERY STUPID YESTERDAY.....I MESSED UP MY ENGINE > I PUT SOMETHING IN MY ENGINE...YESTERDAY NIGHT THAT IS MAKING MY ENGINE > NOCK...LIKE MY VALVES...I PUT AN OIL TREATMENT IN..AND I TOOK HER ON THE > HIGHWAY TO RUN IT THRU MY WHOLE ENGINE...NOW IT IS NOCKING..BAD...I NEED A > COURSE OF ACTION..WHAT SHOULD I DO...I GOT AN OIL CHANGE TO FLUSH THE > STUFF...ITS STILL NOCKING..SHOULD I WAIT AND LET THE OIL CHANGE TAKE EFFECT > OR DO U THINK IT HAS DAMAGED SOMETHING..I HAD A TUNE UP SUMMER OF > 2000...HAVE NEVER HAD ANY ENGINE RELATED PROBLEMS...NOW MY VALVES R NOCKIN > > > > _________________________________________________________________ > Send and receive Hotmail on your mobile device: http://mobile.msn.com > > >