Sierra 18-7758 Oil Filter - Replaces Mercury 35-877761K01 - Fits 75/90/115 HP EFI & 150 HP 4-Stroke Outboards

The Sierra 18-7758 is a spin-on oil filter engineered for Mercury 4-stroke outboard engines. Its heavy-wall steel canister is epoxy coated for corrosion resistance, an important feature for a component that lives in a marine engine bay and is regularly exposed to moisture and salt air. Inside, the high-efficiency filter media meets or exceeds OE filtration standards, helping keep engine oil free of contaminants that accelerate wear on internal components.

This filter uses a 22mm x 15 thread spec and is designed as a direct fit for specific Mercury 4-stroke outboard applications, so it threads on and seals the way the original equipment filter did. It is intended for routine oil-change service and is compatible with 10W-30 FC-W oil across its listed applications. Whether you are performing scheduled maintenance or replacing a worn filter, the 18-7758 is built to hold up to the demands of the marine environment while protecting your engine's oil supply.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-7758
• Product Type: Oil Filter
• Material: Steel
• Finish: Epoxy Coated
• Thread Size: 22mm x 15
• Item Dimensions: 4 x 4 x 3 inches
• Weight: 0.89 pounds
• OEM Cross Reference: 35-877761K01
• Recommended Oil Viscosity: 10W-30 FC-W
• Package Contents: One (1) Oil Filter

Fitment

• Mercury 75HP EFI (1B366822 & Above), 2006-2011
• Mercury 90HP EFI (1B366822 & Above), 2006-2011
• Mercury 115HP EFI (1B366822 & Above), 2006-2011
• Mercury 150HP (4-Stroke), 2011-2015

Replaces (OEM)

• 35-877761K01

Frequently Asked Questions

What engines does the Sierra 18-7758 oil filter fit? The 18-7758 fits Mercury 75HP, 90HP, and 115HP EFI 4-stroke outboards (1B366822 and above), 2006-2011, as well as the Mercury 150HP 4-stroke outboard, 2011-2015.

Is the Sierra 18-7758 a direct replacement for the Mercury OEM filter? Yes, it directly replaces Mercury OEM part number 35-877761K01.

What thread size does this oil filter use? The 18-7758 has a 22mm x 15 thread spec, matching the original Mercury filter it replaces.

What material is the 18-7758 filter canister made of? It is made of steel with an epoxy coating for corrosion resistance, plus a heavy-wall canister design for further protection against corrosion.

How much does the Sierra 18-7758 oil filter weigh? This oil filter weighs 0.89 pounds.

What are the dimensions of the 18-7758 oil filter? The filter measures 4 x 4 x 3 inches.

What oil should be used with the 18-7758 filter? Across its listed Mercury outboard applications, 10W-30 FC-W is the recommended oil for use with the 18-7758.

Does the 18-7758 filter meet OE filtration standards? Its filter media meets or exceeds the original equipment manufacturer's filtration performance.

What is included when I order part number 18-7758? One oil filter is included per order of the Sierra 18-7758.

Will the 18-7758 fit a Mercury 75HP carbureted outboard? No, the 18-7758 is specified for the 75HP EFI application (1B366822 and above), 2006-2011, not the carbureted version.

Is this a genuine Sierra part or an aftermarket copy? The 18-7758 is a genuine Sierra-branded oil filter, sold under Sierra's own part number and warranty.

Does the 18-7758 filter come with a warranty? Yes, the Sierra 18-7758 is backed by Sierra's manufacturer warranty.