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For the first time since I bought my 2019 6.7 F250 in December 2019, I am going to switch oil brands. I have used religiously Amsoil's Signature Series Max-Duty Synthetic Diesel Oil 10W-30 and will be switching to Mobil Delvac Extreme Heavy Duty Full Synthetic Diesel Engine Oil 15W-40. The...

Hello Memebers! This is my first post here, so bear with me. I have long been an avid fan of two fully synthetic oils; Mobil One and Amsoil which I have used exclusively in my 2003 F250 Superduty with a 6.8L V10. For my last four oil changes I have dropped using the Amsoil brands strictly...