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The Gates PCV valve kit for 2004–2009 Audi S4 4.2L V8 is a replacement crankcase vent assembly that restores correct ventilation and oil separation for those model years. Built to match the S4’s venting design, the kit is a vehicle‑specific service part intended to return the engine’s crankcase ventilation to proper operating condition without broad compatibility assumptions.
Gates 04-09 Audi S4 V-8 4.2L PCV Valve Kit Crankcase Vent Valves
