EOS has been discontinued, besides, GM actually stated that it should not be used as a regular oil suppliment as it can cause pre-ignition problems. It was only intended as a break in lube. There is a similar product from Crane Cams, however, same deal, only used for braek in. According to the guys at the machine shop I use (the original owner has over 50 years experience with engines) they say that proper break in is the key, once the engine is properly broken in, there should be no issues with running regular oil. However, if you are concerned,
this might be another soultion.
BTW, I've heard all of the horror stories in which the so called "professional engine builder" that assembled the engine quickly blames the oil for whatever failure occured. Sounds like a dodge to get out of warranteeing sloppy work to me.
