at at 50,000 miles the lifters started rattling bad you could hear them in the hose no help from dealer said maintenance was not performed regularly wrong had receipts pull the pan the oil screen was gloged up 90 percent i have been using there of as they recommended still after 1500 miles have to do it again same thing screen is so stopped sometimes i have to soak it in gas to loosen the crap it is like beef jerky any ideas. have tried every oil on market