Just to let you know that I bought 2 cartons(250ml each)of this a couple of days back and I'm impressed!
I put the recommended 225ml approx in the engine, the little remaining from the first bottle in the power steering fluid. 50-60mls in the fuel tank and a little in the coolant to help protect the pump apparently. Can't get to the gear box fluid yet so that will have to wait.
So far the engine sounds less rough on cold starts, revs more freely and sounds smoother too. I also have less variator noise at start up when the oil runs a bit low.
As my car tends to use alot of oil, the product gives me confidence that even when it runs a touch low, even though I do top it up regularly, the ZX1 coating will help protect it.
I find that it makes it easier to put higher gears early too as there is less hesitation and smoother running, though I will try this again to make sure.
I will report back once the product's 'runs in' more as it works by coating metal when operating at high temperatures.
It's £17.99 a bottle in Halfords but I recommend it.