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I run 10-11K changes on my 6.0 w/ the FS-2500. NEVER any longer regardless of what blackstone says. At the end of the change interval it gets noticeably louder and rough running. You are running a 12-15000$ motor, taking chances to save a couple bucks is insane.
7.3 yes no problem
Big rig yes
heavy equipment yes
6.0 HELLL NO! These things love to sheer oil.
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