I have a 02 WR426F and i just change to Rotella T oil, used to use YamaLube. The YamaLube was 20W40 and this Rotella T is 15W40. I would put about 1.75 quarts in it and was always with in the two marks. Now that i am using Rotella T i put the same amount in but it well only be with in the two marks, but only right after running. If i let it sit for ten minutes did is it almost not even on the dipstick, after 20 mins the dip stick is dry. I have checked the oil pressure bolt to make sure they is pressure, and they is. It is getting very cold out, would this have anything to do with it.