If it were me, I would drain out the synthetic very soon. Refill with a lighter weight regular motor oil with some ZDDP added I prefer the ZDDPlus additive or maybe the GM EOS Additive. I would run that for a few oil changes. When it quits burning some oil, that would indicate the rings are lapped in and then go to eynthetic if you wish............................MO On Mar 12, 11:58 am, Jacob Fox <imfast...@xxxxxxxxx> wrote: > Hey guys, question: > > New motor with only a 100 miles on it. After 300 I figure ima change it. Has anyone ever used z-alt? I was recommended to use it, but from someone that has never used it themselves, just read stuff on it. I did some research but I rather ask people that may have used it. Another brought to my attention by Gary was amsoil. I wanna keep the motor in good health and fresh for many years to come! It's a 440-6 btw if it matters. > > Sent from my iPhone -- -- Please address private mail -- mail of interest to only one person -- directly to that person. That is, send parts/car transactions and negotiations as well as other personal messages only to the intended recipient, not to the Clubhouse public address. This practice will protect your privacy, reduce the total volume of mail and fine tune the content signal to Mopar topic. Thanks! 1962 to 1965 Mopar Clubhouse Discussion Guidelines: http://www.1962to1965mopar.ornocar.org/mletiq.html and http://www.1962to1965mopar.ornocar.com/general_disclaimer.html. -- You received this message because you are subscribed to the Google Groups "The 1962 to 1965 Mopar Mail List Clubhouse" group. http://groups.google.com/group/1962to1965mopars?hl=en.