Dan, new member to the forum and went to the very end and am working my way forward regarding Hemi problems. Mine is circa 2003, 111,500 miles. The " Owner's Manual" indicates 5W-30 to even 10W-30. Two weeks ago my engine started with lifter and rod noise, so is parked. Mechanic (not Ddodge) did some extensive testing and also indicated that there is some obscure memo regarding Hemi's from birth should be using 5W-20 oil. So am wondering wherin you derived this information. NEED TO KNOW, thanks.