I did alot of research into zddp additives, several different types, some have to much while others have less than 5% and alot of regular oil mixed in. Some of which is already in the oils, and then there are the ones who think they are getting it in the oils which in not to proper amounts.
Any zddp for our cars are better than none, but I personally like to know what I am putting into the car specifically and want the proper amounts.
I now sell the zddplus due to it being accurately advertised ( it was even tested independantly to verify ) and it is the proper amount for which our cars need. A simple solution that works.
I am not saying it is the only solution but you do get exactely what is needed and it comes from a gentleman who is sponsoring alot of racing, at the GS Nationals, turbobuick.com event and FAST racing.
A buick vendor shall we say, so why not suport that to boot while getting a great product.
Thanks
Bill