0W 30 over 0W 40 – brief road trips?

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RogerSalesCar
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Joined: Sat Aug 24, 2019 10:25 pm

The oil formulator has painstakingly balanced the oil additives; trying to guess what they are is not a good idea. There is no guarantee that more of something would be beneficial. In the case of oil, for instance, increasing the concentration of specific anti-wear compounds has the opposite effect of improving performance.
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