Sierra Oil Filter 18-7915-1, Replaces OMC 5031411/778885, Fits Evinrude 25-70 HP Outboards

The Sierra 18-7915-1 is a spin-on oil filter built for Evinrude outboard motors, designed to trap contaminants from engine oil while standing up to the corrosive marine environment. It uses a heavy-wall steel canister with an epoxy coating for corrosion resistance, and it is fitted with an anti-drain-back valve that keeps oil in the filter between engine starts so lubrication reaches critical components immediately on startup instead of after a delay. Inside, a high-efficiency filter media meets or exceeds the filtration performance of the original equipment filter it replaces.

This filter is engineered to meet the demands of high-horsepower marine engines and is manufactured to meet or exceed the specifications of the original equipment part. It threads on with a 3/4 inch x 16 NPT thread and measures 3 x 2.9 x 2.8 inches with a 0.75 inch outside diameter. Use it with a 10W40 synthetic blend FC-W rated engine oil.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-7915-1
• Product Type: Oil Filter
• Material: Steel
• Finish: Epoxy coated
• Valve Type: Anti-drain-back valve
• Thread Size: 3/4 inch x 16 NPT
• Outside Diameter: 0.75 inches
• Item Dimensions: 3 x 2.9 x 2.8 inches
• Weight: 0.47 pounds
• Recommended Oil Type: 10W40 Synthetic Blend FC-W
• OEM Cross Reference: 5031411, 778885
• Quantity: 1 filter

Fitment

• Evinrude 25 HP, 2000-2001
• Evinrude 25 HP, 2004-2007
• Evinrude 30 HP, 2000-2001
• Evinrude 30 HP, 2004-2007
• Evinrude 40 HP, 1999-2006
• Evinrude 50 HP, 1999-2006
• Evinrude 60 HP, 2002-2006
• Evinrude 70 HP, 2001-2006

Recommended oil fill for these engines runs 3.2 L / 3.4 Qt on the 25-30 HP models, 2.4 L / 2.5 Qt on the 40-50 HP models, and 4.5 L / 4.8 Qt on the 60-70 HP models, all using a 10W40 synthetic blend FC-W oil.

Replaces (OEM)

• 5031411
• 778885

Frequently Asked Questions

What OEM part numbers does the Sierra 18-7915-1 replace? The Sierra 18-7915-1 oil filter replaces OEM part numbers 5031411 and 778885, so either number can be used to confirm this is the correct filter for your engine.

Which Evinrude outboards fit the 18-7915-1 filter? This filter fits Evinrude 25 HP (2000-2001 and 2004-2007), 30 HP (2000-2001 and 2004-2007), 40 HP (1999-2006), 50 HP (1999-2006), 60 HP (2002-2006), and 70 HP (2001-2006) outboard motors.

Does this filter have an anti-drain-back valve? Yes, the 18-7915-1 includes an anti-drain-back valve, which keeps oil inside the filter between starts so the engine gets lubrication immediately on startup rather than running dry for a few seconds.

What thread size does the Sierra 18-7915-1 use? It uses a 3/4 inch x 16 NPT thread, and the filter has a 0.75 inch outside diameter.

What is the 18-7915-1 filter made of? It is built with a heavy-wall steel canister that is epoxy coated for corrosion resistance in the marine environment, a step up from typical automotive filter housings.

What oil should be used with the 18-7915-1 filter? Sierra specifies a 10W40 synthetic blend FC-W rated engine oil for use with the 18-7915-1 on the Evinrude outboards it fits.

How much oil does my Evinrude outboard hold when using this filter? Oil capacity depends on the engine: 25-30 HP models take 3.2 L / 3.4 Qt, 40-50 HP models take 2.4 L / 2.5 Qt, and 60-70 HP models take 4.5 L / 4.8 Qt, all using 10W40 synthetic blend FC-W oil.

What are the dimensions and weight of the Sierra 18-7915-1? The filter measures 3 x 2.9 x 2.8 inches and weighs 0.47 pounds.

Is the Sierra 18-7915-1 a genuine part or aftermarket? The 18-7915-1 is a Sierra branded filter manufactured to meet or exceed the filtration performance of the original equipment part it replaces, backed by Sierra's warranty.

What is included when I order the 18-7915-1? Each order includes one 18-7915-1 oil filter.

Is the 18-7915-1 the same filter used on other Evinrude horsepower ratings? No. Evinrude 15 HP (1995-2001) and 70 HP (1998-2000) models use the 18-7916 filter instead, a different Sierra part number, so it is important to match the filter to your engine's HP and model year rather than assuming interchangeability.

How do I know if my filter housing size matches the 18-7915-1? The 18-7915-1 has a 3/4 inch x 16 NPT thread and a 0.75 inch outside diameter; confirming these dimensions against your old filter helps verify fitment before installation.