I just bought a new 1993 Cabriolet - 1.8 8v k-jet and it has a sticker under the bonnet that my 1991 one didn't have saying 91-93RON minimum or something along those lines. I've been putting 95 in mine for about the 3 times I've ever put fuel in, but that's purely because 95RON is standard unleaded in Europe they don't use 91 like the cars over here.
As for oil I remember the Castrol I bought being like a pretty cheap version - it wasn't one of the newer ones that's VAG approved.
2019 132TSI Tiguan
2011 Audi S4 Wagon
1988 MK1 Caddy
2006 Polo GTI
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