zMax?

Does anyone have experience in how well zMax works, in general?

How well does it work on engines with over 100k miles?

And does it need to be used regularly or can I just use it occasionally?

Thanks again.

I once bought that at an Autozone but quickly returned it when I did a search on google.

I realized that for some people it just didn't work and many motor oil makers just recommend not to add any additives to your oil.

If I were you I would just get really good oil.

If you use 5W-30 oil I would get...

Royal Purple Racing 21 Synthethic

OR

Amsoil Series 2000 5W-30 Oil

These are some of the bests and I've gotten good results with those motor oils.