Oil amount

I have a 95 civic ex. d16z6 engine. Honda told me that the oil pan will hold up to 3.8 liters, but on my air intake box, it says 3.2 liters. I put right about 4 liters in Sunday when I changed oil. What is the right amount?

Also, it is leaking just a little, either from the drain plug or the filter, but I am pretty sure I tightened them down decently, since I didnt want to over tighten. Is this leaking because there is too much? its not alot, maybee 20 drops after I left it sit over night each night. Problem?? or is there one... I wiped the underneath side pretty good from where it had dripped down when I changed oil........ advice would be greatly appreciated.