Xorti7, I am not surprised. All else being equal, a thicker oil will be quieter in an engine than a thin one.
When you see (hear) a difference between two brands of oils, however, it's usually due to the additive packages.
Oh, and be aware that after 1,500-2,000 miles, most 10W-40s shear down to a 10W-30 ... but they won't go any lower than that under normal circumstances.
Actually, it's a pretty decent oil weight for use in high-performance engines ... especially the better brands (Pennzoil, Chevron & Havoline) as well as the "High-Mileage" oils.
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--- Bror Jace
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