Hey guys, im about to drain the coolant on my Civic EK4 B16A2, just wondering if there is a nipple bleeder anywhere. I tried looking for it around the engine but could not find it.

Also is it better to use the genuine Honda coolant? I have a Concentrated Nulon coolant, is it safe and good to use? Otherwise, I wont do it until i get the genuine Honda coolant.

Has anyone used fibre or copper washer for their sump plug? which one is better to use?

I will greatly appreciate any information you guys can provide! Thanks in advance!