What is the best way to quite down piston slap in a ford motor. I have a 2000 focus with 72,000 miles on it. I have been using Mobil 1 5w30. Would BG MOA help at all.
Don't worry about it. Just drive gently until it goes away. I dont believe there is any oil that will make a significant difference with cold start up piston slap.
Try Redline 5w-20 or Amsoil 0w-20. I've never heard of a DOHC engine having piston slap issues, are you sure it's not the chain tensioners (if your engine has chains)...
I know what piston slap is, it mostly happens in pushrod engines, haven't heard of DOHC engines having the same problem although it is possible I guess.