Please help. I have oil leaking out the dipstick tube. It looks like the CDR is the same as it still has a blue sticker on it that says what way is up. Truck starts fine and I will be doing new injectors and glows at the end of the month. Truck runs fine, idles fine and has plenty get up and go. It is not using any antifreeze and exhaust looks clear other than at first start up in the morning. I'm really hoping it is not a hole in piston or bad head gasket. No oil in the antifreeze either. I know there is a knocking sound at idle that I believe is a sticking injector. With the tube of the intake from the CDR you can feel a lot of air blowing out. With the oil fill cap upside down, there is not enough pressure to blow it off. Is is worth the price of the CDR just to see if that makes a difference?