Did you guys know there is a dye in most engine oils? I did not know that. They put it in there so if some one tries to claim engine damage from their oil they can put a light on it and see if it was their oil.
So if you take apart your engine, and it is red, or blue or vermillion in the top end, you can be it is oil.
It explains why when I drained my Castrol
GTX it is reddish tinge. The heat activates the dye.