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I have been concerned and curious about this for probably about a couple years now. Thanks for explaining how same viscocity oil can have such variance in pressure. At this point I will stick with the Valvoline and as long as the pressure remains on the higher side between change cycles, as it...

Thank you all for your responses. I was hoping for an answer as to why this is happening. Was of the misconception that "bobistheoilguy" would have more than "fake news" as a reply. I won't waste anymore of your time.

Thanks for letting me know this site is worthless.

This is repeatable. The oil was just changed from Valvoline with over 6000 miles less than 100 miles ago. Will be dumping that for Valvoline which will be the 3rd time. This truck runs straight through on highway from CT. to Cape Breton Island a distance if 900 miles each way straight thru...

Oil change at Firestone using Pennzoil full synthetic 5w30, idle oil pressure 18 2000 rpm 38 Oil change at Goodyear with Valvoline full synthetic 5w30, idle oil pressure 38 2000 rpm 58 This has happened twice. Valvoline maintained that oil pressure for the duration of use roughly 6000 miles all...