I have used this stuff in the past, for nothing more than maintenance as it's cheap.
The reason I post the new no., is that it has come up on the forum before and seems to be recomended. The new stuff is different though, it's clear and one 90 ml can is for 45-75 Litres, The other part no. seems to be for a product that is more similar to the old product. (190 ml bottle).
I have no real way of telling if it actually does any good, but £6 every so often does no harm.
This comes up on the web, generally, on Audi forums as the FSI engines suffer from the problem with oil mist on the back of the valves. As posters there point out, no fuel additive can touch this problem as the fuel is injected directly.
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