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Start with basic mineral 2T such as Shell advance. 20ml is enough for a 10 litre tank.
Avoid semi-synthetic as they may/will apparently form deposits when burnt.
Don't go for the most expensive 2T as IMO, it defeats the purpose of this cheap engine tuning trick. Namely, it must be cheap.
500ml Shell Advance 2T (yellow bottle mineral one) = $5.35. Enough for 25 full tanks. Use Shell 95/98 + Shell 2T = cheaper than V Power