First, this is a great forum. Thanks to all who routinely share their knowledge. I have a Ram 1500 with a 5.9, 70K miles. I am the original owner and have run season dependent oil from 10-30 Syn Blend or synthetics in the winter to 15-40 PZL LL in the San Antonio summers. OCI has been 3-4K since new. Uses no oil between changes. Like millions, I have run F*** (although Tough Guard, not the orange death). No known filter failures, but valve noise at startup always bugged me. After digging through a ton of posts here, I went to a Pure One and Rotella T 5W-40. No noise. I am a convert for life. I had already made the jump to Pure One and M1 5W20 in my wife's Honda Pilot (that was really really hard for someone who grew up on 10W-40 Dino). Thanks again to all of you who frequent this forum and share your expertise.