So I have a 2008 civic si. I was doing some research on oils and trying to figure out what oil I should use when I get my oil changed soon and noticed that everyone is using 5w-30 oil. I’m like that’s weird, why are they using oil that isn’t the recommended viscosity for our cars? I had my oil changed last time at the Honda dealership and they changed it with 5w-20 and also my oil cap on my car says 5w-20. I looked online and found an owners manual pdf on Honda’s website and it says the 2008 civic regular models take 5w-20 and that the si takes 5w-30. Why does my oil cap say 5w-20??? I’ve been using the wrong oil this entire time??? Has it caused unnecessary wear to my motor? At this point I’m pretty pissed off as to why my car has a 5w-20 oil cap and I’ve been mislead this entire time.