I just did a search and read a little to confirm that the Z only takes 4 quarts of oil after I just did my first oil change. The owners manual even said 3 5/8! My 1.6 liter civic took 4 quarts! It just amazes me that an engine almost double that size takes the same amount of oil. I read about someone asking if anyone upgrades their oil pans and there weren't really too many replys to that question. Why not? Seems like it would be a fairly beneficial upgrade to me considering that it only takes 4 quarts. Just a little weird to me. I was hanging out with a friend and he didn't even believe that it was full...he just stared at the dipstick for a while until it sunk in. Any comments...feel free.