Sierra 18-7921 - Oil Filter, 24 mm x 1.5 Thread
Sierra 18-7921 - Oil Filter, 24 mm x 1.5 Thread
Sierra
31 in stock
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Sierra 18-7921 - Oil Filter, 24 mm × 1.5 Thread
For an oil change requiring Mercury 35-896546T, 35-877767K01 or 35-877767Q01, Sierra 18-7921 provides an aftermarket replacement filter with a listed 24 mm × 1.5 thread. The replacement references make it easier to match the filter specified for your engine, while the thread specification offers an additional identification check. Confirm the engine application before ordering rather than relying on thread size alone.
Part Specifications
- Part Number: 18-7921
- Component: Oil filter
- Thread Specification: 24 mm × 1.5
- Replaces Mercury: 35-896546T, 35-877767K01 and 35-877767Q01
Confirm Fitment Before Ordering
Use the parts diagrams available on our website to identify the oil filter specified for your engine. Alternatively, send us your engine model and serial number by email, text or live chat, and we'll confirm fitment before you order.
Additional Information
- Vendor: Sierra
- Part Number: 18-7921
- OEM Cross-Reference: Mercury 35-896546T, 35-877767K01 and 35-877767Q01
For the Quicksilver option corresponding to one of these references, compare the Quicksilver 35-877767Q01 outboard oil filter. Verify the filter required by your engine's model and serial number before choosing either listing.
Installation Notes
Refer to the applicable engine service manual for oil-filter replacement, sealing-surface preparation, tightening requirements and post-service oil-level and leak checks.
Frequently Asked Questions
Q: What thread size does Sierra 18-7921 use?
A: The listed thread specification is 24 mm × 1.5. Matching the thread alone does not establish complete filter compatibility.
Q: Which Mercury oil filters does it replace?
A: The listed replacement references are Mercury 35-896546T, 35-877767K01 and 35-877767Q01.
Q: Does this fit every Mercury four-stroke engine?
A: Universal Mercury four-stroke fitment is not established. Match your engine's specified filter reference using its model and serial number.
Q: Is this a Sierra filter or a Quicksilver filter?
A: This product is the Sierra 18-7921 aftermarket filter. Quicksilver 35-877767Q01 is a separate catalog option linked above.
Q: What are its micron rating and bypass-valve specifications?
A: Those specifications are not provided in this listing. Select by the verified replacement reference and confirmed engine application rather than assuming filtration or valve specifications.
! Compatibility references are provided for informational purposes only and do not constitute a fitment guarantee. Part numbers, application listings, and "replaces" cross-references are based on manufacturer data and are intended as a starting point for identification — not a guarantee of fit for your specific engine, hull, or installation.
Buyer is solely responsible for verifying compatibility with their engine model, serial number, model year, and trim configuration before purchase. If you are unsure whether this part fits your application, contact MacombMarineParts.com before you buy — we're available via text, email, or online chat to help verify compatibility for your specific application.
MacombMarineParts.com is not liable for parts ordered based on assumed fitment. Returns due to buyer-selected incorrect fitment are subject to our standard return and restocking fee policies.