Its a little expensive but hemi's love redline 5w30. I run it in my 6.4 that calls for 0w40 pennzoil ultra platinum and I couldn't believe how much quieter the motor was after putting in the redline oil. My truck truck has never had the "hemi tick". It's a thicker 30 weight and has a lot of moly in it. Otherwise rather then adding lucas to the oil add 15 ounces of lubegard biotech. That also has a lot of moly and helps quite down the hemi tick.