Ok, got all my stuff to change the fluid and replace the gasket, now my question is did some Impalas have a filler hole? I looked on the cover and there is nothing resembling a filler plug and the back of the pumpkin is nothing except for something that resembles a pen but its looks like a breather valve. Now do I just remove the cover and let everything drip and then on filling, do I just keep the top bolts loosen why I squeeze the fluid in. What is the amount do I put in, 2 litres 75w/90 and 1 additive, right? Thanks, I'm just very overly cautious on this.