Sierra 18-7913 Oil Filter, Replaces Mercury 35-822626Q1/Q3, Fits Mercury/Mariner 8-30HP Outboards

The Sierra 18-7913 is a spin-on oil filter engineered for Mercury and Mariner outboard engines ranging from 8HP through 30HP. It is designed to trap contaminants and combustion byproducts from engine oil, protecting internal components and helping extend engine service life during routine oil changes. The filter uses a paper filtering element housed in a compact canister with a 20mm x 1.5 thread, matching the oil filter mount on the compatible Mercury and Mariner powerheads.

This filter is intended for use with 10W-30 FC-W rated engine oil, the oil type specified for the outboard engines it fits. It is a direct cross-reference for the Mercury Quicksilver 35-822626Q1, 35-822626Q3 filters, and it meets or exceeds the performance of the original equipment part it replaces. Buyers replacing a worn or clogged filter during scheduled maintenance can install the 18-7913 as a drop-in equivalent without modification.

Fitment spans multiple Mercury and Mariner outboard displacements and model years, including 8HP (323cc), 9.9HP (323cc), 15HP (323cc and 351cc), 20HP (351cc), 25HP, and 30HP engines within the serial number and year ranges listed below. Always confirm the horsepower, engine displacement, and serial number break against your outboard before ordering to ensure correct fit.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-7913
• Product Type: Oil Filter
• Material: Paper
• Thread Size: 20mm x 1.5
• Outside Diameter: 20 millimeters
• Item Dimensions: 3 x 3 x 2.9 inches
• Weight: 0.48 pounds
• Recommended Oil: 10W-30 FC-W
• Compatible Engine Oil Capacity: 1.0 liter 1.05 quart
• OEM Cross-Reference: 35-822626Q1, 35-822626Q3

Fitment

• Mercury/Mariner 8HP (323cc), 2001-2004
• Mercury/Mariner 9.9HP (323cc), 1999-2004
• Mercury/Mariner 15HP (323cc), 1998-2008
• Mercury/Mariner 15HP (351cc), 2008-2011
• Mercury/Mariner 20HP (351cc), 2008-2011
• Mercury/Mariner 25HP (serial 0T801000 and up), 2006-2011
• Mercury/Mariner 30HP (serial 0T801000 and up), 2006-2011

Replaces (OEM)

• 35-822626Q1
• 35-822626Q3

Frequently Asked Questions

What engines does the Sierra 18-7913 oil filter fit? The 18-7913 fits Mercury and Mariner outboards including the 8HP (323cc, 2001-2004), 9.9HP (323cc, 1999-2004), 15HP (323cc, 1998-2008 and 351cc, 2008-2011), 20HP (351cc, 2008-2011), 25HP (serial 0T801000 and up, 2006-2011), and 30HP (serial 0T801000 and up, 2006-2011).

Is the 18-7913 the same as the Mercury 35-822626Q1 filter? Yes, the Sierra 18-7913 is a direct cross-reference for the Mercury Quicksilver 35-822626Q1, 35-822626Q3 oil filters and installs as a drop-in equivalent.

What thread size does this oil filter use? The 18-7913 has a 20mm x 1.5 thread with a 20 millimeter outside diameter, matching the oil filter mount on its compatible Mercury and Mariner outboards.

What material is the filter element made from? The filtering element in the Sierra 18-7913 is made of paper, designed to trap contaminants from engine oil during normal operation.

What oil should I use with the 18-7913 filter? The compatible outboard engines call for 10W-30 FC-W rated engine oil, which is the oil type this filter is designed to work with.

How much oil do the engines that use this filter hold? Engine oil capacity varies by model but is 1.0 liter 1.05 quart for the 8HP through 30HP engines that take the 18-7913 filter.

What are the dimensions and weight of the 18-7913 oil filter? The filter measures 3 x 3 x 2.9 inches and weighs 0.48 pounds.

Will this filter fit a 25HP Mercury outboard from before 2006? No. The 18-7913 fits 25HP Mercury/Mariner outboards with serial number 0T801000 and up (2006-2011); earlier 25HP units on serial 0T800999 and lower use a different Sierra filter part number.

Does the Sierra 18-7913 meet original equipment performance standards? Yes, the 18-7913 is built to meet or exceed the performance of the original Mercury equipment oil filter it replaces.

What is included when I order the 18-7913? Each order includes one Sierra 18-7913 spin-on oil filter.

How do I know if the 18-7913 is the correct filter for my outboard? Check your outboard's horsepower, engine displacement (cc), model year, and serial number against the fitment list for the 18-7913 to confirm it matches before ordering.