I have a 1999 F550 Super Duty 7.3 and I'm changing the oil I took the old oil filter off I got a new oil filter STP it's 3786 look it up online it says that's right filter but it won't thread more than halfway any ideas
I saw in your other post where you said you where in the middle of nowhere. I had this issue with my brother's GMC - except the kwickie lube forced the filter and damaged the threads. Fortunately, the GMC has a removable insert, but I'm not sure our trucks do. I would be inclined to drain your old filter and re-use it. At least until you can get another one coming. Try to stick to the Motorcraft filters when you can.