I don't know if it's just our altima or if it's all of them, but this engine is freakin noisy. There's a terrible valve tick until fully warmed up and even when warm it's still noisy. I'm running a nissan oil filter and gtx 5-30. I've tried PP 5-30 and didn't think it was any better but I was running a k&n oil filter at the time. Is there any other oil that might make this thing a little quieter? Ohh yeah it's an 08 with like 15,000 miles.