I had read a couple of posts discussing problems with the Wix 51515 xp which is the same as the Napa platinum I believe. I had bought a couple of the napa platinum parts a year ago and had installed the second one in December at about 140000 miles. I started noticing lifter/valve noise after start up. Its a 3fe, so I adjusted the valves and it helped a little bit but not a lot. I was running 10w30 during the winter so I chalked it up to the lighter oil. Winter here is Louisiana is very mild. I run 15w40 or 50 during the summer which is very hot and humid. I started noticing that the oil pressure was taking longer and longer to build up on start up. After about 10 to 20 seconds the oil pressure would be normal but the valves would clatter another few minutes.
Weather has been getting hot lately, up in the 80s during the day with lows in the 70s at night so I decided to do and oil change. Anyone with a 3fe knows how big of a mess a filter change can be because of the filter screwing down on to the block. This time however, there was no oil in the filter when I unscrewed it. It was clear that the filter had drained right back into the pan in just the few minutes that it took me to pull the truck in and pull the drain plug.
I replaced the valvoline full synthetic 10w30 and Napa platinum with Mobil 1 15w50 and a fram ultra synthetic filter started it up let it run and topped off the oil. This morning when started it up the oil pressure went up within a second or 2 with no valve noise. I noticed that the first startup after I put the oil in and the empty filter that it took the same 10 to 20 seconds to build oil pressure like the napa filter did every start up.
I think there is a problem with the wix/napa filters so just be aware. I do not think any long term damage was done and I do not have an ax to grind. I used Wix and Napa for a lot of applications but I believe with the way the 3fe mounts it upside down so it is possible to drain all the oil straight back into the pan, the drain back valve used in those filters is not adequate.
Weather has been getting hot lately, up in the 80s during the day with lows in the 70s at night so I decided to do and oil change. Anyone with a 3fe knows how big of a mess a filter change can be because of the filter screwing down on to the block. This time however, there was no oil in the filter when I unscrewed it. It was clear that the filter had drained right back into the pan in just the few minutes that it took me to pull the truck in and pull the drain plug.
I replaced the valvoline full synthetic 10w30 and Napa platinum with Mobil 1 15w50 and a fram ultra synthetic filter started it up let it run and topped off the oil. This morning when started it up the oil pressure went up within a second or 2 with no valve noise. I noticed that the first startup after I put the oil in and the empty filter that it took the same 10 to 20 seconds to build oil pressure like the napa filter did every start up.
I think there is a problem with the wix/napa filters so just be aware. I do not think any long term damage was done and I do not have an ax to grind. I used Wix and Napa for a lot of applications but I believe with the way the 3fe mounts it upside down so it is possible to drain all the oil straight back into the pan, the drain back valve used in those filters is not adequate.