Brewer205

the reason you are loosing a lot of oil can be from yes the pcv. but thats not the big problem. the pcv gets plugged allowing too much crankcase pressure. where does it go? the path with least resistance, rear main seal. i just did mine a day or so ago and i noticed on my pcv there was alot of dirt buildup around it. which if you oil will collect any dust and will tell you if you have a leak. i had the same issue oil low sign came on, filled it. next day same thing but i smelled burnin oil. underside of truck was covered and it was coming from bellhousing. indicating rear main. hope this helps