New member, thanks in advance for your input. Planning my next oil change. Some time ago I had stopped using the mfr recommended 5W-20 oil based on high usage between changes. I have ahd good results with Amsoil Synthetic 0W-30, but the same issue with usage as I believe I had made a poor selection with 0W in the summer time in the Northeast. However, I will post that UOA shortly. I recently used a Brad Penn 10W-30, however, I did not realize that this oil may not be good for my catalytic converter. No UOA results for the Brad Penn as I had to add a different oil out of necessity. Only observation was a slightly higher oil pressure - and that may have just been me looking for some discernible improvement. I do think the truck ran well with the BPenn. My driving, mostly around town, but I do some highway driving and I tow a bass boat 50 miles one-way on average twice a month. My driving style would be considered as conservative. I have enjoyed using this site for information and I am now a member. I'm curious what recommendations some of you would have given my set up. My current choice is the Amsoil Synthetic 10W-30 based on the low noack volatility and decent TBN. Thanks you.