Sierra 47-237804 Oil Filter – Onan Marine Generator
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You have 30 days to request a return. All sale items are final sale.
Sierra 47-237804 Oil Filter – Onan Marine Generator
A direct-fit replacement oil filter for Onan marine generators, engineered to Sierra’s marine-grade specifications. Designed to maintain proper oil flow and filtration efficiency through the full service interval, this filter helps protect your generator’s engine from wear-causing contaminants — keeping your onboard power running reliably whether you’re at anchor or underway.
Sierra’s marine oil filters are built to meet or exceed OEM specifications for fit, filtration media quality, and bypass valve performance. Verify fitment against your Onan generator model and service manual before ordering.
Key Features
- Direct-fit replacement for compatible Onan marine generators
- Meets or exceeds OEM filtration specifications
- Engineered for marine generator service intervals
- Quality filtration media for effective contaminant removal
Best Use Case
The right choice for boaters performing routine oil changes on their Onan marine generator who want a reliable aftermarket filter at a lower cost than the OEM part. Particularly practical for liveaboards and cruisers who service their generator regularly and want a trusted marine-grade filter on hand. Always cross-reference your Onan generator model number against Sierra’s application guide to confirm fitment before installation.
Parts Desk Insights
If you prefer the OEM filter for your Onan generator, see the Cummins Onan Genuine Oil Filter – 185-7444. For a WIX aftermarket alternative, see the WIX Oil Filter 51344 – Cummins Onan Generator. If your vessel runs a Kohler marine generator instead, see the Sierra oil filters for Kohler: Sierra 47-237822, Sierra 47-237823, or Sierra 47-237824.
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.