I've had my compass for about 4 mths. now. a few days ago I checked the engine oil level. I checked it while cold on level ground. The oil level was exactly half way in the safe section on the dip stick. So I added almost half a liter which brought it to the very top of the safe crossed section. I'm hoping I didn't add too much. The manual says the level should be about halfway, but reading other website information, they say you should top it up to the full mark. I'm wondering if it's okay to have the level right at the full mark, or a little above.