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I realize it's tempting not to pull the pan... But DO IT. Often times the pan looks clean, just the holes in the screen are plugged as it free floating contaminants in a apparently clean pan that plug the screen.
DO NOT USE ANY TYPE OF A CRANKCASE FLUSHING ADDITIVE! This breaks free the debris and... You know where it ends up?
I suspect when you remove the pick up tube and you shine a flashlight through it you won't see many open holes. I have done it too many times to believe this one won't be plugged. And you won't know, until you know. Do you want to risk a $ 1,000 worth of turbo charger on it?