I have a 2002 Chevy Tahoe, 5.3L. It has been losing oil between changes and I have to add about 1.5 to 2 quarts every 1500-2000 miles. We cannot physically find the leak and have never had oil spots on the driveway. When doing some recent repairs to the water pump, I noticed a black buildup sprayed from the base of the oil filler neck. The tube has always been loose, but I have never lost pressure so never thought anything of it. In doing some research, I see that there are a few things that can be done: an o-ring inside the oil filler neck can be replaced, the tube can be replaced, or the whole filler neck can be done away with and the cap can be screwed directly into the engine. Just wanted to hear some feedback before I order some parts or melt my cap to the engine.
Love my truck and want it running as long as I can!