Got the ticking from the silverado as i stated a few weeks ago. I am currently running Mobil 1 5w30. The tick got a lil quieter after mmo but than got louder. Now it seems i hear it loud sometimes than not at all other times. I want to run some Deere 15W40 Plus50II I have. Will that do anything for me? Is that too thick? Also whats a good way to clean out my engine. Its not sludgey at all. always had 3-5K OCIs on dyno. any advice? Thanks in advance