K&N HP-1008 Premium Oil Filter

The HP-1008 fits a wide range of Honda, Acura, Infiniti, Mazda, Mitsubishi, Nissan, and Subaru vehicles — including the Honda Civic (2003–2023), Honda Accord, Honda CR-V, Honda Pilot, Honda Odyssey, Acura TL, Acura MDX, Acura RDX, Acura TSX, Nissan Altima, Nissan Frontier, Nissan Sentra, Nissan GT-R, Subaru Impreza, Subaru Forester, Subaru Legacy, Subaru Outback, Mazda3, Mazda CX-5, Infiniti Q50, and many others. The thread size is M20 x 1.5. Always verify against your vehicle's service manual or the K&N fitment guide before purchase — Amazon fitment data occasionally lags the manufacturer's own guide.

The anti-drain-back valve (ADBV) is a one-way valve inside the filter that prevents engine oil from draining back down into the oil pan when the engine is shut off. Without a functional ADBV, the oil film at the top of the engine can drain away during parking, leaving the upper engine dry at startup. The HP-1008 uses a silicone ADBV, confirmed in K&N's own product cross-section imagery. A functional ADBV means oil pressure builds faster at cold start, reducing bearing wear during the highest-wear moment of engine operation.

K&N claims the HP-1008 traps up to 98% of contaminants at 30 microns. However, no independently verified SAE J1858 multi-pass test data has been located for the HP-1008. The 98% / 30-micron figure on the product packaging is a manufacturer claim and should be treated as such rather than as independently certified performance. This is reflected in the CCT quality score for filtration efficiency.

K&N markets the HP-1008 with a '20,000 Mile Engine Protection' claim, qualified on K&N's own packaging as dependent on following your vehicle manufacturer's recommended change intervals. K&N Engineering has not published post-service cut-open data specifically corroborating the HP-1008's structural integrity at 20,000 miles, and independent community data from extended-drain runs at this interval has not been located. The manufacturer-stated service interval is noted, but community corroboration of the 20,000-mile claim is absent.

The California Proposition 65 warning on K&N oil filters is standard for metal automotive parts that contain nickel, lead, or other Prop 65-listed heavy metals in trace quantities from the steel canister, end-caps, or base plate materials. This warning is common on oil filters as a category and does not indicate a chemical exposure hazard from normal use of the filter. The filter itself is a passive physical accessory — there is no chemical emission from the filter media or canister during normal engine operation.