Aftermarket Oil Filter for Mercury/Mariner 4-Stroke Outboards – Replaces 35-877761Q01, 35-877761K01 and Sierra 18-7758
Aftermarket Oil Filter for Mercury/Mariner 4-Stroke Outboards – Replaces 35-877761Q01, 35-877761K01 and Sierra 18-7758 is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
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Aftermarket Oil Filter for Mercury/Mariner 4-Stroke Outboards – Rep...
Aftermarket Oil Filter for Mercury/Mariner 4-Stroke Outboards – Replaces 35-877761Q01, 35-877761K01 and Sierra 18-7758 is backordered and will ship as soon as it is back in stock.
Product Details
This aftermarket oil filter is intended for selected Mercury and Mariner four-stroke outboards. It is listed for use with Mercury 75, 80, 90, 100 and 115 HP EFI four-stroke models using the applicable serial-number ranges shown below. The filter is also cataloged as a replacement for Mercury part numbers 35-877761Q01 and 35-877761K01, with Sierra reference 18-7758.
The spin-on design supports straightforward routine oil-service work. Always compare the part number and engine serial number with your engine documentation before installation.
- Aftermarket replacement oil filter for Mercury/Mariner applications.
- Spin-on installation for convenient servicing.
- 22 mm x 1.5 thread specification.
- Anti-drain-back valve design helps limit oil drain-back during engine shutdown.
Part Number Matrix
These references are provided for identification and cross-reference purposes. They do not indicate that the product is manufactured by Mercury, Sierra or Mallory.
| Brand or Reference Type | Part Number | Relationship |
|---|---|---|
| Mercury | 35-877761Q01 | Primary OEM reference |
| Mercury | 35-877761K01 | Replacement reference |
| Sierra | 18-7758 | Aftermarket cross-reference |
Engine & Model Compatibility
The catalog relationships below keep the model, horsepower, stroke and serial conditions together. Confirm the complete engine model and serial number before ordering; horsepower alone is not sufficient to establish fitment.
| Brand | Model | Rated HP | Stroke | Applicable Reference | Serial Condition |
|---|---|---|---|---|---|
| Mercury | 75 EFI | 75 | 4-Stroke | 35-877761Q01 | 1B366823 through 2B094995 |
| Mercury | 80 EFI | 80 | 4-Stroke | 35-877761Q01 | 1B366823 through 2B094995 |
| Mercury | 80 EFI | 80 | 4-Stroke | 35-877761Q01 | 0P459572 through 2B094995 |
| Mercury | 90 EFI | 90 | 4-Stroke | 35-877761Q01 | 1B366823 through 2B094995 |
| Mercury | 100 EFI | 100 | 4-Stroke | 35-877761Q01 | 1B366823 through 2B094995 |
| Mercury | 100 EFI | 100 | 4-Stroke | 35-877761Q01 | 0P459572 through 2B094995 |
| Mercury | 115 EFI | 115 | 4-Stroke | 35-877761Q01 | 1B366823 through 2B094995 |
| Mercury | 150 | 150 | 4-Stroke | 35-877761K01 | 1B905505 and up |
Technical Specs
- Product Type
- Oil filter
- Product Construction
- Aftermarket replacement component
- Installation
- Spin-on
- Thread Specification
- 22 mm x 1.5
- Valve Feature
- Anti-drain-back valve
- Primary OEM Reference
- Mercury 35-877761Q01
- Additional Replacement Reference
- Mercury 35-877761K01
- Aftermarket Cross-Reference
- Sierra 18-7758
What’s in the Box
- 1 x aftermarket spin-on oil filter
Installation Notes
- Confirm the replacement references and engine serial number before beginning service.
- Place a suitable drain pan beneath the existing oil filter.
- Loosen and remove the old filter using an appropriate filter wrench if necessary.
- Clean the filter mounting surface and check that the old gasket has been removed.
- Apply a thin film of clean engine oil to the new filter gasket.
- Thread the new filter onto the mounting base by hand until the gasket contacts the base.
- Tighten according to the engine manufacturer’s service instructions. Do not overtighten.
- Check the oil level, run the engine, and inspect the filter area for leaks.
Maintenance & FAQ
How do I confirm this filter fits my engine?
Match your existing filter reference and verify the complete engine model, four-stroke configuration, horsepower and serial number. The cataloged applications include Mercury 75, 80, 90, 100 and 115 HP EFI models with the serial ranges listed above, plus a Mercury 150 HP four-stroke application using reference 35-877761K01 from serial 1B905505 and up.
Is this an OEM filter?
No. This listing is for an aftermarket replacement oil filter. It is cross-referenced to Mercury 35-877761Q01 and 35-877761K01 and to Sierra 18-7758.
What does the anti-drain-back valve do?
The anti-drain-back valve helps prevent oil from draining back toward the crankcase while the engine is shut down, helping reduce dry-start conditions.
When should the oil filter be replaced?
Replace the filter according to the maintenance schedule for your specific engine and oil-service interval. If the engine manufacturer specifies a different interval, follow that guidance.
What should I do if the filter leaks after installation?
Stop the engine, allow the filter area to cool, and check that the old gasket was removed, the new gasket is seated correctly, and the filter was tightened according to the service instructions. Do not operate the engine with an active oil leak.
Safety & Important Information
- Verify the complete engine serial number and the reference on your original filter before purchase.
- Do not rely on horsepower alone to determine compatibility.
- Use the correct engine oil and follow the engine manufacturer’s service procedure.
- Dispose of used oil and the old filter in accordance with local regulations.
- This is an aftermarket replacement, not a Mercury-branded OEM component.
About Sea Sierra
- Marine Parts Support — We provide replacement components for routine marine maintenance and repair.
- Application-Focused Listings — Product references and fitment conditions are presented to help customers verify the correct part.
- Replacement Value — Aftermarket options help support dependable servicing without representing themselves as original manufacturer components.
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