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I do think we need more info then that. Tell us what you did, how you did it, and all about what is happening while trying to start the truck. What truck do you have? Oil in the HPOP? Things like that.
How long have you cranked and how do you know for sure you don't have HP oil? When I drained mine, it took several 10-15 second cranks to build up enough pressure to get id started.
that's y I'm asking if it was new or rebuilt. If the ball bearing is on the wrong side of the non serviceable plug the op would hear a noise that sounds like a leaky tire, after cranking.