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Jamie86

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  1. 2010 Silverado with 140,000. I switched from Valvoline High Mileage synthetic blend to Valvoline High Mileage full synthetic both 5w-30 and from a Valvoline VO88 oil filter to a Wix Xp. Why did my oil pressure go from 41-42 psi at cold idle to around 28 at cold idle after switching?
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