I usually use Purolator premium plus oil filters, but every once and a while i will go with a Wix. I have heard that Napa gold is a Wix oil filter. Anyway, the Napa Gold filter would take longer for my oil pressure gauge to go up. Every morning it would take about 4-5 seconds after the engine was started for the gauge to go up. It would show nothing, then it would go up fast. I switched back to Purolator Premium Plus and the gauge goes up fast instantly. Why is this? I thought maybe the rubber plate was stronger to let oil into the Napa-Wix filter.