I had been using the ACdelco ultraguard golds, then wasn't able to get them. I switched to the PureOne, but since I started reading up on filters, I have switched to an STP filter. I noticed a slight oil pressure drop, which tells me that the PureOne is noticeably more restrictive. If the K&Ns weren't more expensive and more dificult for me to get I'd run them.

John

 

Did you notice the pressure drop with the STP filter or the Pure One?

 

STP filter. Actually, you know what, I'm an idiot, just remembered I bought 5w30 instead of 10w30 for that oil change. Nevermind!!