Thanks. With the 300 SEL hot, I added a 1/2 qt. and already it runs better, but I think it still needs a little, but I am afraid to overfill.

It is really weird, sometimes when I put the dipstick in, no fluid is seen, other times, the fluid is high on one side, but there is no fluid on the other side. (Maybe this means it is still low). Shouldn't it be slopped with fluid on both sides? I get the feeling that somehow the fluid is being dragged in the tube when I am pulling out and it is giving the appearance that there is more fluid that there actually is?? I am thinking that is why the stick is so angled, to prevent that?

I checked the 420 when it was cold for kicks and giggles and the dip stick was covered completely over the mark.