Sierra Oil Filter 18-7918, Replaces Mercury 35-877769K01, Fits Verado L6 225-300 HP Outboards

The Sierra 18-7918 is a spin-on oil filter engineered for Mercury Verado L6 in-line six-cylinder outboards. It is built around an epoxy-coated, heavy-wall steel canister that resists corrosion in the marine environment, paired with high-efficiency filter media designed to meet or exceed OE filtration standards. An anti-drain-back valve keeps oil in the filter between starts, protecting critical engine components from dry-start wear and helping maintain steady oil pressure from the moment the engine fires.

This filter is sized for Mercury Verado L6 outboards rated 225, 250, and 275 horsepower (2005-2011) and 300 horsepower (2007-2011), each of which uses a 7.0L / 7.40 quart crankcase filled with 25W-50 synthetic blend FC-W oil. It uses a 24mm x 1.5 thread and directly replaces Mercury OEM filter 35-877769K01, so it installs using the same mounting thread and filter footprint as the original part. The canister measures 5 x 3.25 x 3.25 inches and weighs 0.81 pounds. Whether performing a scheduled oil change or a full service, this filter is a straightforward, direct-fit replacement for the covered Verado L6 outboard models.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-7918
• Replaces (OEM): 35-877769K01
• Fits: Mercury Verado L6 225 HP (2005-2011), 250 HP (2005-2011), 275 HP (2005-2011), 300 HP (2007-2011)
• Crankcase Capacity: 7.0L / 7.40 Qt.
• Recommended Oil: 25W-50 Synthetic Blend FC-W
• Thread Size: 24mm x 1.5
• Material: Steel
• Item Dimensions: 5 x 3.25 x 3.25 inches
• Weight: 0.81 pounds
• Filter Feature: Anti-drain-back valve

Fitment

• Mercury Verado L6 225 HP, 2005-2011
• Mercury Verado L6 250 HP, 2005-2011
• Mercury Verado L6 275 HP, 2005-2011
• Mercury Verado L6 300 HP, 2007-2011

Replaces (OEM)

• 35-877769K01

Frequently Asked Questions

What engines does the Sierra 18-7918 oil filter fit? The Sierra 18-7918 fits Mercury Verado L6 in-line six-cylinder outboards rated 225 HP, 250 HP, and 275 HP (2005-2011), as well as the 300 HP Verado L6 (2007-2011).

What OEM part number does the 18-7918 replace? Sierra 18-7918 directly replaces Mercury OEM oil filter 35-877769K01, using the same 24mm x 1.5 thread and filter footprint.

What thread size does this filter use? The 18-7918 uses a 24mm x 1.5 thread, matching the mounting thread of the Mercury Verado L6 outboards it is designed for.

How much oil does a Verado L6 crankcase hold when using this filter? The covered Verado L6 outboards (225, 250, 275, and 300 HP) hold 7.0L / 7.40 quarts of crankcase oil when serviced with the 18-7918 filter.

What type of oil should be used with the 18-7918 filter? Mercury Verado L6 outboards using the 18-7918 filter call for 25W-50 synthetic blend FC-W oil.

What is the 18-7918 filter made of? It is built with an epoxy-coated, heavy-wall steel canister for corrosion resistance in the marine environment.

Does the Sierra 18-7918 have an anti-drain-back valve? Yes, an anti-drain-back valve is built into the 18-7918 to retain oil in the filter between engine starts, reducing dry-start wear.

What are the dimensions of the Sierra 18-7918 oil filter? The filter canister measures 5 x 3.25 x 3.25 inches.

How much does the 18-7918 oil filter weigh? The Sierra 18-7918 weighs 0.81 pounds.

Is the Sierra 18-7918 a genuine Mercury part or an aftermarket replacement? The 18-7918 is a Sierra-branded replacement filter engineered to meet or exceed OE filtration performance while cross-referencing to Mercury OEM part 35-877769K01.

Can the 18-7918 be used on any Mercury outboard? No, the 18-7918 is sized specifically for Mercury Verado L6 outboards rated 225, 250, 275 HP (2005-2011) and 300 HP (2007-2011); it is not a universal fit for all Mercury models.