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Thanks guys.
JFP's logic of different additives not having a cumulative effect on oil weight makes sense, and since there is no telling if Mobil 1 is consistent in using the same additives for viscosity throughout their line...
I'll steer clear of cocktails and boatdrinks for my car and just stick to a single malt beverage, paying extra and waiting a bit to get a good marque (Castrol Syntec) if I have the time, sipping the local (M1) brew if the time window is tight.
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