I believe because of engine fan direct drive, I have never gotten over 7.3 and this is running the overhead, change air filter every two years and perform full PM services at every 5000 miles reguardless. I also add Lucas to my oil and I drive between 62/65 on cruise as much as possible. Unless you're software has been updated, you have a 330.
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2004 GS Crescendo
350 Cat C7 Acert / MH 3000 Auto
Toad: 2011 Silverado Z71 4x4
Blue Ox Avanti 2
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