6.0L powerstroke towing with 10w30

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I plan on 5-7k max intervals, I'd never run it that long
 
Many of you guys are forgetting about the stupid HEUI systems in these PSD engines. These are not your typical "small diesel" truck engine and certainly nothing close to a monster diesel used in a class VIII truck. They only hold 15 quarts of oil, not 15 gallons and the HEUI injection system beats the oil up at 2-3 times the rate a normal engine would.

I however, love 10W30 in my 05 PSD, and I tow heavy with it regularly with NO issues. Overall it starts better, seems to run smoother and gets slightly better MPG's than 15W40. However I will NOT ever go above a 7000 mile OCI in one of these trucks. Its cheap insurance for me to change the oil and keep the HPOP happy.
 
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