Is there any evidence (anecdotal or otherwise) which shows that certain filters cause oil pressure drop?
Heaps of folks running non Nissan filters. Purolators, mobil 1, original k&n guts are very similar. If anything, the guys with aftermarket oil coolers using non Nissan filters and using oil with a hot viscosity other than 30 would be most likely to notice any impacts in VVT performance.
Not having a go at you but im keen to learn more too. I have always used Mobil 1 filters on my Z. Originally the slightly longer M1-110 but now the prescribed M1-108. Didnt notice any diff. I ran 5w40 oil for a few months and now im back to 5w30. The conclusion? VVT behaviour is more consistent and predictable on 5w30. Our engines are not corolla engines which will be fine with anything called an oil in the sump. It feels like the ecu has no self learning feature in the VVT control (compensation for component wear, oil viscosity, etc).
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