"The reason i asked was beacause i wanted to bring my old tyres up to the level of new ones for practise "
Tyres have two components for grip, chemical grip activated by the heat of driving where the rubber becomes more 'sticky' and mechanical grip where the rubber interacts with the road.
Tyre softeners do not work in the same way as the chemicals that are there in the tyre in the first place. It is difficult to get the same degree of chemical grip because most of us aren't able to measure and apply the chemicals in the exact proportions needed to duplicate chemical grip.
Mechanical grip is a function of the mix that makes up the tread and the depth of tread remaining on the tyre. Think of it as 'twanging' a ruler. You get a totally different effect if the ruler is long from when it is short, even though the material of the ruler hasn't changed. It's this difference in the depth of rubber left that makes the tyre perform differently, even though there appears to be lots of rubber left on the tyre and it is still the same 'hardness' as the original.
So it is almost impossible to duplicate the effect of new tyres accurately, and it is accuracy that you want, not just 'more grip'.
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