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How long to put duramax fuel filter?

Initial replacement

2004 thru 2010 LB7 models: 24,000 miles of 24 months

2001 thru 2016 (except 2006) LLY, LBZ, LMM, LML: 15,000 miles or 12 months

Subsequent replacements

All 6.6L (3125cc) Duramax models: 7,500 miles or 6 months