Please don't say shit like that mate, it's embarrassing.
You simply can't judge an oil quality by power figures.
Sure, you can get a decent power loss by using an oil that is much too thick (see Sin, Penrite), but c'mon man, saying a 1kw drop in power could be expected because an oil is of near quality to another oil is like saying that my hands are warmer today because I wore my Rivers shoes instead of my sneakers.