As I said "Making a difference" , and lo and behold today a prime example.
I tested a Hyundai Getz at lunchtime and the emissions failed badly on high CO. The owner was disappointed as he'd just "thrashed" it up and down the by-pass.
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Almost 3 times the limit after a full Cat test and oil temperature taken. The man then puts in a bottle of Forte petrol treatment and gives the car a blast up the by-pass. When he returned I completed exactly the same test as at lunchtime with an improved reading on fast idle CO but slightly raised idle CO as below.
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Only 2.3 times the limit now, so he said I'll give it on more go and if that fails it's scrap (not wanting to fit a new Cat) Another bottle of Forte and another run up the by-pass, last chance saloon,
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Same test, same oil temperature on 2nd fast idle test (full Cat test) and it passes, albeit on the limit. No new Cat and only £30 spent.
May not work for every vehicle but this proves that it can and does work.
Tony.