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Originally Posted by cnavarro
We did however notice that when switching from Mobil 1 0w40 to Motul 5w40, overall engine vibration dropped 5%.
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At the risk of hijacking the thread
, how much of that vibration reduction is the Motul and how much is the 5w40? I.e. could we expect to see that with any good 5w40, like maybe Castrol Syntec?