First oil change coming up, need some advice.

G35guy84

Getting back to the purpose of the thread and away from opinionated comments, where do K&N and Royal Purple fit into the oil filter mix in terms of quality?

I know AK bought K&N and a few others like that particular brand, but I was leaning more toward buying Amsoil or Royal Purple. To me, both look like quality filters, but I'm no expert.

Also, I can't find Royal Purple's API group number anywhere. I've heard that it's in group IV, but I've also heard it's in group V. However, I also read that Group V oils are reserved for air compressors and similar motors because they're not compatible with petroleum-based fuels and can actually damage auto engines.

__________________
'09 Nissan 370Z Base 7AT - Sport Package - Pearl White | Performance Mods: Stillen G3 CAI | F.I. HFC | F.I. TDX CBE w/ 18" resonators | Megan Racing coilover kit | Ichiba rear camber kit | 20mm front / 25mm rear H&R spacers | Aesthetic Mods: White interior/license plate LEDs | 6000K bulbs | 20% tint