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by fords manual(the owners manual that your truck came with) 10k is normal, and 5k is extreme service. i change mine at 5-7
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2008 Ford F-250 CC SB
Dark Pearl Blue(complete repaint under warranty)
6" Stage II Pro Comp Lift
17x9 Pro Comp 7189
37x12.5 BFG M/T KM2's
Spartan/4" duals/AFE
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