Don't be without it.
From Ralph of Grand Blanc Twp, Michigan on 3/20/2020.

Have been using this product for years. Once the oil drain plug washer was left out and all the oil leaked out on an hour and half freeway drive at 75 mph. When I exited the freeway the oil pressure gauge went to zero. The engine temp never got hot, did not hear any tapping noise from the lifters. ZMAX truly protected my engine. I will "NEVER EVER STOP USING IT." Have a 1999 Ford Ranger with 289,000 plus miles, engine runs smooth and quite as day one.

Response from zMAX: Awesome that your engine was protected by zMAX. Thanks for being a zMAX customer!

D.o.D LS perfection
From Bradley Caruthers of Lakeland, Florida on 1/19/2020.

If you have a Chevy with Displacement on demand this stuff is a must. I didn't notice how little the the DoD was engaged until about a week after I installed zMAX in my 2012 5.3 Suburban. Now it will hold 4 cylinders anytime I'm not under increased load. This has increased the MPG from 14.5 avg. to 18 avg. If someone would have told this to me ahead of time I would have laughed out loud. Something else I noticed is the trans runs about 15° cooler unloaded and 30° when pulling a trailer. Again if you have a chevy with DoD give this stuff a try. You may be pleasantly surprised as I.

Response from zMAX: Glad you are getting great results using zMAX, especially with a load. Thanks for being a zMAX customer!

Highly recommended
From Mike Bally of Jenks, Oklahoma on 1/13/2020.

I’ve used zMAX for years in my fuel and oil with no issues.

Response from zMAX: Thanks for being a long-time customer!

Multi Use
From Anonymous of Freehold, New Jersey on 12/26/2019.

Used in cars and lawn equipment

It works!!
From The Sarge of Toms River, New Jersey on 11/21/2019.

I been using this product for some time now. I have used in Domestic and Asian production vehicles both new and over 100K with great noticeable results!!

Response from zMAX: That's great! Thanks for being a zMAX customer!