During the winter cold my 99 ss makes a knocking sound from the engine for about 5 secs. from the start up. I was thinking about putting lucus syn. additive to it. Has anyone else used this before, and is there anyone who feels this would be a bad idea? Any suggestions please.

 

I dont think it will change anything.

 

"Lucas"

Why not fix the problem, rather than trying to cover it up? If there even is a problem.... a little bit of piston slap in cold weather is not unusual. What viscosity oil are you using? What is the lowest ambient temperature you see on cold start?

 

I use mobil syn 5w-30. I just wanted see if that would help with the cold start. I don't think theres anything wrong with the car. The temp is abou 30F