Gassed up the 92 500SL and inadvertently pressed the 89 octane button instaed of the 91 octane. Filled the tank, Car idles a little rougher.
Will it cause damage to the engine?
Don't really want to remove and replace. Gasoline is not something I like to play with.
Should I buy a octane booster or just wait till I use up 1/2 the tank and refill with higher grade.

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Thanks, Juan