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  1. 99-03 7.3L General Discussion
    My late-99 7.3 had always had Delo 15w40 dino oil since birth. Switched to Rotella T4 a couple of years ago when the Delo was no longer on Ford’s “approved” list. With 115k miles, I have no oil leaks and it runs great, even towing a 26-foot travel trailer. If it matters, the highest the EOT has...
  2. General 6.7 Discussion (2011-2016)
    I just rolled past 100k miles on my 2015 F350. The first two oil changes were with Motorcraft oil, the next couple were with Mobil 1 (expensive), next couple were Rotella 5W-40 (cheap, but loud ticking), then have run Valvoline PBX for the next 70k miles with great success. Switching gears to...
  3. General Diesel Discussion
    Greetings everyone! Let me preface this with I was a die hard "T6 or bust" guy for years... ever since I got my company trucks in 2010. For the sake of this thread and discussion, it’s a 6 truck fleet of all 6.0 Powerstrokes (four are 2006, two are 2007) and those of you in here who know how...
  4. General 6.4L Discussion
    My brother in law and I were having this debate and I can't find anything on here that directly solves our argument. I want to run rotella 5W40 full synthetic on my 09 6.4 that i just bought, 129k miles. He said once i make the switch i cant go back to conventional. Only reason being is travling...
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