Do different oils have vastly different rates of thermal expansion? How cold does oil need to get to stop contracting? I have been using Rotella T6 in Subaru Forester, and I noticed that if I check the oil level hot, it is above the notch on the dipstick that is above the "full" mark. When I check it cold, it is between the "low" and "full" marks. It didn't seem to do this as much with Mobil 1 EP 5w30, and it also didn't seem to contract so much in the summer.
As long as the oil is over the "full" mark when hot, it should mean that I haven't lost any, right?
As long as the oil is over the "full" mark when hot, it should mean that I haven't lost any, right?