For more than five decades, Sierra International has been a trusted leader in high-quality aftermarket engine and drive components. Originally focused on the marine industry, Sierra has expanded its product line to also serve RVs, ATVs/UTVs, and outdoor power equipment. The brand brings together Sierra, Prime Line, Shields, and Moeller products under one name, offering customers a comprehensive range of solutions for both land and water applications.

From engine and drive parts to oils, lubricants, filtration, instrumentation, connectors, and general hardware, every Sierra product is engineered to meet or exceed OEM performance standards. Their commitment to quality ensures dependable operation, whether maintaining a fishing boat, upgrading a recreational vehicle, or servicing utility equipment.

With distribution operations in Litchfield, Illinois, Sierra International supports American jobs and provides quick access to parts across the United States. Built on a legacy of innovation, durability, and customer trust, Sierra continues to be the go-to choice for those who expect top-tier performance from their equipment.



This NMMA-certified 10W-40 full synthetic oil is safe for engines equipped with catalytic converters. It reduces wear, prevents deposit buildup, and protects against corrosion in harsh marine environments. 

Ideal for modern 4-stroke marine engines in both saltwater and freshwater use.

SIERRA MARINE 10W-40 FULL SYNTHETIC CATALYST OIL (Quart)

$15.48

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