So this is strange. I have always used ford 5.0 oil filters on my R/T, but when I went to prime my oil pump the other day, I wasn't getting any oil coming up to the head. So I pulled the oil filter off and it had a little oil in it, but not much. So I grabbed an extra oil filter I had (I thought it was an extra 5.0 I had laying around) So I put it on and prime the pump again, and still no oil coming up. When I pull this filter off, it lets a bunch of air out like the filter was pressurized, but the oil couldn't get out of the filter. So now I am worried that there is something blocking the oil passage. :bang head I also had a new mopar filter for a 2.2 (the small one) that I had never used, so I put it on and prime the pump again, and everything works out just fine. wtf? The second filter I tried may have been an extra I had for my jeep (4.7) so I am not concerned with that one not working, but what was going on with the first filter?