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I was running liqui moly 5w-40 until my 10k dealer oil change the other day. I felt no difference between it or the 0w-30 the dealer put in or the 5w-30 at the 1.5k interval.
I switched to 5w-40 as I did my own oil change around 6k and for the "added protection" during so cal summer/fall track days.
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