thanks guys for all your inputs. There are some doubter which is normal myself being one by default. However there seems to be no negatives about the product
officially over here, only the super 99RON contains cleaner & upper cylinder lubricant but costs £1.51/liter
(I kid you not)
TBH since my car needs 95RON and only does 32mp(uk)g, I cannot not justify the extra cost.
I am thinking of using one bottle in half full tank once in a while (ever 2 years maybe?). 300ml bottle to 30l petrol
the product we get here is Techron Concentrate Plus Fuel System Cleaner marketed by Texaco