The NAPA 1791 Engine Oil Filter (Wix 51791) is a high-quality engine oil filter designed specifically for Caterpillar engines. Made in China, this filter is a direct replacement for the OE/OEM part number 1791 and manufacturer part number 51791. With a quantity of 1, this filter is a reliable and essential component for maintaining the engine's health and performance. Perfect for car and truck owners looking for a durable and efficient oil filter solution.