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Every oil check and top-off at the fuel island goes through the Peterbilt Engine Oil Filler Cap, so a lost or cracked cap is more than a cosmetic problem. Without a tight cap, dirt and water can enter the crankcase and oil can mist out onto the engine. Snapping the Peterbilt 1330191-AS onto the fill neck restores a sealed opening. The engine stays clean on the outside and protected on the inside, and drivers do not have to improvise a cover with a rag.
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