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There are literally pages of full threads on the topic...OP might use Search Tab for hundreds and hundreds of opins.
Seems to be two camps:
-use nothing but premium, and even pages of debates on 'which brand'
-use premo and occasional 89, brand being besides the point.
My anecdote is: occasional premium, more than occasional ~89, and the 3.0 IL6 hasn't missed a beat in 96k+ miles/almost 13 years.
Run what you choose/like, imo.
GL, mD
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