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I change mine at 4K because I see dusty conditions. Also, because of a diesel's nature, they run dirty. The only way to get the crud out is to change the oil. I did the same with my 6.0, and Blackstone said I was showing noticeable oil shear, but it was still OK. Well, OK isn't good enough for me- besides, my 6.4 makes the oil dirtier faster than my 6.0 did. No, it's no longer cheap insurance, but it's cheaper than premature engine failure, and I don't care WHAT the engineers say, 10K is way too long an interval for an oil change especially if you run conventional oil. If you run that long, I'd take it to the dealer and document each oil change completely.
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Red 2002 F-350 XLT SRW 4x4 7.3L reg. cab 6-speed rubber floors traded at 50K for:
Red 2005 F-350 XLT SRW 4x4 6.0L reg. cab 6-speed rubber floors BFG 12.5x35 mud-terrains, no lift traded for:
Red 2008 F-350 XLT SRW 4x4 6.4 reg. cab 6-speed. Got carpet this time- audiophile stereo deletes rubber floors. BFG 12.5x35 mud terrains, no lift.
Traded at 45K for: Red 2011 F-350 XLT SRW 4x4 6.7L reg cab BFG 12.5x35 mud terrains, no lift. "optioned" out of- stick shift, rubber floors, audiophile stereo, fog lights, chrome step bars GRRRRR!
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