Truck has head gasket replaced 3 months back . Water leak in head front of motor.Gssket sealant added and looks good. 4 months later oil spraying by fan All over in engine comparent. Pouring oil in it a week ago and at front of motor right under valve cover it's leaking out as I put it in..!! The half moon plastic piece is leaking bad. So I pull off valve cover and put gasket sealant on half moon And put cover back on and torqued cover. Run past few days but oil is leaking again in engine compartment. Now I pull oil dipstick and it reds no oil. I grab gallon oil container and twist off oil filler cap in the dark. Start to pour oil in and instantly overruns valve cover. Valve cover is full up of oil !!! Yet dip stick shows no oil. The red low oil light flickers once in a great while? Seems I drove it for hour or two like this. It's the weirdest thing. Oil sending unit replaced few months ago. Can't see to slot oil leak source .. Oil is clean. ..recent oil change. I have no idea now Anyone??