ONAN 509-0258 OIL SEAL - ONAN Genuine OEM Part
ONAN
- Payment methods
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- SKU:
- ONAN 509-0258
- MPN:
- 509-0258
- Condition:
- New
- Availability:
- Ships (leaves our warehouse) within next business day if in stock


Available Inventory
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Competitive Pricing
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Customer Support
Our team is always ready to answer your questions and provide the best assistance.
Description
- Genuine ONAN OEM replacement part engineered for perfect fit and function.
- Prevents oil leaks to maintain engine lubrication and prevent contamination.
- Enhances engine longevity by effectively sealing critical rotating components.
- Reliability engineered for your Cummins generator's demanding performance needs.
ONAN 509-0258 OIL SEAL - Trust ONAN’s precision engineering to keep your engine sealed and performing at its peak
This ONAN 509-0258 oil seal is crafted to provide a secure barrier, keeping oil contained within the engine’s rotating assemblies while blocking dirt and debris. Essential for maintaining clean internal conditions, it safeguards the heart of your generator from premature wear. Secure this vital component today and ensure uninterrupted, efficient power generation performance backed by genuine Cummins quality.
Benefit that truly matters for your peace of mind
- Authenticity guaranteed: Engineered by ONAN to exact OEM standards for seamless compatibility.
- Enhanced durability: Manufactured with premium materials to withstand high-temperature and pressure conditions.
- Optimal sealing performance: Minimizes oil leakage, promoting better engine efficiency and reduced downtime.
- Protects your investment: Helps maintain warranty compliance and preserves system reliability under critical loads.
Details
Category: Oil Seals
Product SKU: ONAN 509-0258
Our team is committed to providing knowledgeable guidance to help you secure the right parts for your Cummins and ONAN equipment. You can reach out anytime through our help center for expert advice tailored to your specific needs. We hope your purchase leads to a smooth, effective repair and prolonged generator reliability, supporting your power needs with confidence.
Returns Information
You may return new, non-used, and unopened items within 30 days of delivery date under a 20% re-stocking fee in case you do not need it anymore or you have ordered a wrong item.
We cannot accept any returns on "Pumps, Motors, Electrical Items & Transmissions" whether the product is used or new, however in rare cases we may allow an exception under a 40% re-stocking fee.
If you need to return an item, please go to our chat located in the lower right corner, select the option “Returns” and follow the steps to submit your request. Please have on your hands pictures of the item, they will be requested. You will shortly receive an answer from our Customer Service Team providing authorization and return instructions. Likewise, if an exception cannot be authorized, you will receive an answer from us. No returns will be accepted in our warehouse without an RMA number (Return Merchandise Authorization).
All return shipping costs are on customer's responsibility and will not be refundable.
Returns are inspected once they arrive. If the inspection determines that the items are used, non-resellable condition, or damaged, the return will be denied and the customer will be contacted to ship the parts back at the customers' request and cost.
Cancellations
You may cancel your order, in whole or in part, only if the part is backordered and it isn't ready to ship. Once an order has been shipped, sent from the supplier to our warehouse, or in the dispatch line, we cannot cancel it. If your order is shipped, you will need to follow our return policy to return the items you no longer want.
If you need to cancel an order or item for any reason, you may submit a cancellation request directly through your account to the "more options" section or contact us by live chat. All the cancellation requests are evaluated before its approval. If you submit a cancellation request out of business hours, on a weekend or holiday, it will be processed on the next available business day.
Please allow for the cancellation to be confirmed, and check your account for updates on the status. The cancellation process usually takes 24-48 hours to be confirmed by email. We will process your cancellation request and issue a refund to your original payment method.
In the event that an item becomes no longer available (NLA), we will cancel it from your order and ship the remaining items to you. We will send you an email notification if we cancel any part of your order.
Some products may contain chemicals known to the State of California to cause cancer or reproductive harm. ⚠️ WARNING: www.P65Warnings.ca.gov