Sierra Marine Oil Filter — GM L4, L6 & V8 Short Style (47-78242)
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You have 30 days to request a return. All sale items are final sale.
Marine Oil Filter for GM L4, L6 & V8 Engines — Short Style
The Sierra 47-78242 is a short-style marine oil filter designed for GM-based L4, L6, and V8 marine engines commonly found in MerCruiser sterndrives and inboard applications. Built to marine service standards, it provides reliable oil filtration to protect engine bearings, journals, and internal components during normal operation and extended running hours.
Key Features
- Application: GM L4, L6, and V8 marine engines — short style
- Filter Style: Short — fits installations where clearance limits use of a standard-length filter
- Marine-Grade Construction: Built to withstand the vibration, heat cycles, and extended run times typical of marine engine use
- Direct Replacement: Designed as a service replacement for compatible GM-based marine engines
Fitment Notice
Confirm fitment by engine make, model, year, and displacement before ordering. GM-based marine engines are used across multiple sterndrive and inboard platforms. Verify the correct filter thread size, bypass valve rating, and anti-drainback valve requirement for your specific engine before installation.
Installation Notes
Drain the engine oil fully before replacing the filter. Lightly lubricate the filter gasket with clean engine oil before installation. Tighten hand-tight plus 3/4 turn, or to the torque specification in your engine service manual. Do not over-tighten. Check for leaks after the first start and verify oil pressure is within the normal operating range.
Parts Desk Insights
SKU 47-78242 is a Sierra marine oil filter under the Sierra brand, fitting GM L4, L6, and V8 marine engines in the short-style configuration. The short style is specified where engine bay clearance prevents use of a standard-length filter — confirm the customer’s engine requires the short style vs. standard before ordering. GM-block engines appear across MerCruiser, OMC, and some Volvo Penta applications; verify the specific platform and engine code. Weight and barcode are not on file — obtain from Sierra spec sheet.
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 3–4 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
Returns & Satisfaction Guarantee
We stand firmly behind the quality of every product we sell. Your confidence matters to us — and we back it with a straightforward 30-Day Satisfaction Guarantee.
If you are not fully satisfied, you may request a return within 30 days of delivery. All returns must receive pre-approval prior to being sent back. Unauthorized returns will not be accepted.
To qualify for a return:
Item must be in new, unused condition
Product must be in its original packaging
All parts, components, hardware, manuals, and accessories must be included
Packaging must be undamaged and suitable for resale
Important:
Electronics are strictly inspected. No returns on open-box electronics. Exceptions may apply only with prior written approval. Any electronic unit that has been installed, powered, activated, or altered may not be eligible for return.
We are serious about product integrity — and equally serious about taking care of our customers. If there is ever a product issue, contact us immediately so we can make it right.
For return authorization, please contact our support team before shipping anything back.