Yeah, every single day for about as month I have ben getting on BITOG and reading all I can. My wife saw me and said "What are doing, reading about OIL again, you used to read history and novels." Even learned a new work-Tribology --COOL. even cooler we have some on here that post! I've always been an OIL GEEK? love reading about it and changing it, monitering it, stocking up on it etc etc. One thing I think I have gleaned from this site, is that DELO 400 is a great oil. I have about 15 gallons of CI 15-40 of it. Have been using Amsoil 15-40 AME and am satisfied. Put on a Frantz about a month ago. I'm thinking I may top off my truck with the Delo when I am changing my Frantz roll. I will do UOA and when it needs changing, Prolly stick with my Ams. AME. HDD and Marine. I am not so much interested in going 30 or so K OCI as putting best oil in. WHAT ABOUT TOPPING MY FRANTZ FILTER CHANGE OFF WITH THE DELO?????????, think I will do it about every 2 k or so since I probably should have 2 FR. units on. Thanks guys, nice to find kindred spirits. LOTS of knowledgeable Folks on here and yes I am going to donate, would hate to lose such a great site. Oh, my truck is 06 Cummins with a Dodge wrapped around it,(Modded a lot) so no EGR nor DPF,so would like to stay with CI as long as I can Thanks Guys