It's mineral oil with some colouring in it.
The mineral oil thins out the oil in your crankcase, so:
1. You burn less oil, simply because there's less oil in the engine
2. You so go longer between oil changes, b/c there's less oil being used
3. Ever wonder why, after they drain all the oil from the car and go for road laps, they don't tear down the engine afterwards? The zmax crap can run the motor for twenty minutes or so, but not much longer.
See
this link about the Federal Trade Commission currently suing ZMax and the distribution company.
You simply cannot fix most complicated problems with a bottle.
Max
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family full of petrochemical engineers