The Honda 15635-ZG3-800 Extension Oil Filler Gasket (Non-Asbestos) is a genuine OEM replacement designed for BF75 and BF90 outboard motors and GD320 and GD410 horizontal shaft diesel engines. As a direct Honda OEM part, this gasket is manufactured to the exact specification required for a proper oil-tight seal at the extension oil filler. Confirm your machine's serial number against the fitment table before ordering, as Honda supersedes parts at production breaks and the correct gasket varies by build.
Key Features
- Non-Asbestos Gasket Material — the non-asbestos construction is called out in the Honda part name itself, making this the correct replacement where that specification is required
- Genuine Honda OEM Part — sourced directly from Honda, this gasket meets the sealing retention requirements of the extension oil filler without modification or shimming
- Broad Compatible Fitment — fits BF75 and BF90 outboard motors and GD320 and GD410 horizontal shaft diesel engines; verify your serial number against the compatibility table to confirm the correct variant for your unit
- Oil Leak Prevention — a failed or compressed-out gasket at the oil filler extension allows oil to seep past the joint; this replacement restores the seal and keeps oil where it belongs
The extension oil filler gasket seals the joint between the oil filler extension and the engine or gearcase housing, preventing oil from escaping around the filler opening during operation or when the oil level is checked and topped up. On marine outboards such as the BF75 and BF90, maintaining an oil-tight seal at every joint is especially important because a slow leak can go undetected until oil levels drop to a damaging level. On the GD320 and GD410 diesel engines, the same principle applies — a degraded or crushed gasket that no longer seals correctly leads to oil seepage, contamination of surrounding components, and the risk of running low on lubrication without a visible warning.
Part Details
| Part Number | 15635-ZG3-800 |
|---|---|
| Brand | Honda |
| Part Type | Genuine OEM |
| Description | Extension Oil Filler Gasket (Non-Asbestos) |
Compatibility & Fitment
| Name | Models | Serial Range |
|---|---|---|
| Horizontal Shaft Diesel Engine | GD320, GD410 | All |
| Outboard Motor | BF75, BF90 | All |
Verify Before You Order
Fitment is machine-number and revision-specific; always confirm your model and serial number against the fitment list.
Why Buy From DHS Equipment
Every part is verified against the manufacturer's part number before it ships, so what you order is what arrives. We carry parts from leading OEM brands and our own DHS Quality Parts line of professional aftermarket components. Need help finding the right part? Our team is available to confirm compatibility whenever you need it. Orders are processed fast to keep your jobs on track. We don't just sell parts. We keep you jobsite ready.
Questions? Contact our team at [email protected] or 866-611-9369 — DHS Equipment is here to help you maintain peak performance.
