No problem, although when mapping I always tried to recommend Esso or a good 97. That way if they chose to put 99 in then there's extra protection, but they can also throw 97 in and be safe.
Your not going to notice the performance difference with your bum, only on a dyno if done back to back.
I stopped using Shell regularly when it was optimax as my old MY94 used to have cold running hesitation on optimax, which disappeared when I put Esso in and returned on the next tank of optimax.
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