
If you follow the manufacturer's recommendation to change these filters every two oil changes, you'll see how dark they become are and how much they are really needed. I used OEM and tried these aftermarket filters for the first time because the reviews here on Amazon were good and saved $20 over OEM. The under cover detached from the secondary fuel filter under the truck, bypassing fuel contamination entirely. Diesel injectors are way more expensive than the money saved on those cheap Chinese aftermarket filters.

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