I never do the full 2 turns, it always feels too tight. If it's over tightened you can distort the seal enough to cause a leak. Try loosening it a bit, just until you see oil coming out, then tighten it up by hand, but not 2 turns, 1 to 1.5 should be fine. If you can feel that it's on well enough and that it won't turn out by itself then there's no need to try to get it to 2 turns. It's not a like a bolt where you have to turn it until you feel a lot of resistance, it's more like a tap that you close until there's no more water coming out (if that makes sense?)