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OE Quality
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DormanPart #: 090-017
Dorman 090-017 Engine Oil Drain Plug
15 vehicles fit this part
Select your vehicle to confirm fitment
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OE Direct Replacement — Bolt-on fit, no modifications needed
Fitment: Buick, Century, Limited, Roadmaster, Special, Super, Skylark, Roadmaster Series 70, Special Series 40, Super Series 50, Century Series 60, Limited Series 90, and Special Series 40-A
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Not what you need? See all Engine Oil Drain Plug options
Dorman 090-017 Engine Oil Drain Plug
This Dorman engine oil drain plug is a direct replacement for a worn or damaged original drain plug. It matches the required thread pitch for a secure seal and is built for conventional oil drain service on select Buick applications.
Key Features
- Direct replacement engine oil drain plug for OE-style service
- Steel construction with a silver finish
- Fine-thread, SAE design with 11/16 in.-20 single oversized thread
- Hex head with 1 in. head size and 6-point socket engagement
- Gasket included for sealing at installation
- Non-magnetic design
- Fits select 1950-1958 Buick Roadmaster, 1954-1958 Buick Century, and 1954 Buick Skylark applications
Detailed Description
Dorman 090-017 is an engine oil drain plug made to replace a damaged or worn original plug while maintaining the correct thread pitch and sealing surface. The steel body, fine-thread SAE sizing, and included gasket support a proper fit in applications that require an 11/16 in.-20 single oversized thread. This part is a practical service replacement for Buick Roadmaster, Buick Century, and Buick Skylark models listed in the fitment data.
This part cross-references 77-30SK and 7801-A for the same application.
Common Problems It Can Help Address
- Stripped or worn drain plug threads
- Oil seepage at the drain plug sealing surface
- Damaged hex head that makes removal difficult
- Incorrect replacement plug size after prior service work
- Need for a direct-fit drain plug on select Buick oil pans
Installation Notes and Tips
- Verify the drain pan thread size before installation: 11/16 in.-20 single oversized thread
- Use the included gasket to establish the seal
- Install with the correct hex tool to avoid rounding the head
- Inspect the oil pan threads for damage before tightening
- Confirm fitment for the specific Buick model and year before service
Quality Assurance
Built by Dorman as a direct replacement hardware component for engine oil drain service, this plug is specified to match the original thread pitch and sealing requirements for the listed applications.
| Brand | Dorman |
|---|---|
| Part Number | 090-017 |
| Bolt Grade | 3 |
| Color | Silver |
| Describe Type | Single Oversize |
| Drain Method | Conventional |
| Gasket Or Seal Included | Yes |
| Gasket Type | Gasket |
| Head Drive Type | Hex |
| Head Size (SAE/Metric) | 1 in |
| Length | 0.563 |
| Magnetic | No |
| Material | Steel |
| Oversized Thread | Yes |
| Package Contents | 5 Oil Drain Plugs |
| SAE or Metric | SAE |
| Socket Points | 6 |
| Special Tool Required | No |
| Thread Diameter | 11/16 in |
| Thread Pitch | 20 |
| Thread Size | 11/16 in -20 Single Oversize |
| Thread Type | Fine |
| Threads Per Inch | 20 |
This part fits 15 vehicles. Search below:
| Year | Make | Model | Position | Notes |
|---|---|---|---|---|
| 1958 | Buick | Century | N/A | 11/16 In. x 20 Single Oversized Thread; Shank Length (In): 0.563 in; Package Quantity: 5; Dorman - AutoGrade - Boxed; Packaging Type: Box; Thread Size: 11/16 in -20 Single Oversize; Head Size (SAE/Metric): 1 In |
| 1958 | Buick | Roadmaster | N/A | 11/16 In. x 20 Single Oversized Thread; Shank Length (In): 0.563 in; Package Quantity: 5; Dorman - AutoGrade - Boxed; Packaging Type: Box; Thread Size: 11/16 in -20 Single Oversize; Head Size (SAE/Metric): 1 In |
| 1957 | Buick | Century | N/A | 11/16 In. x 20 Single Oversized Thread; Shank Length (In): 0.563 in; Package Quantity: 5; Dorman - AutoGrade - Boxed; Packaging Type: Box; Thread Size: 11/16 in -20 Single Oversize; Head Size (SAE/Metric): 1 In |
| 1957 | Buick | Roadmaster | N/A | 11/16 In. x 20 Single Oversized Thread; Shank Length (In): 0.563 in; Package Quantity: 5; Dorman - AutoGrade - Boxed; Packaging Type: Box; Thread Size: 11/16 in -20 Single Oversize; Head Size (SAE/Metric): 1 In |
| 1956 | Buick | Century | N/A | 11/16 In. x 20 Single Oversized Thread; Shank Length (In): 0.563 in; Package Quantity: 5; Dorman - AutoGrade - Boxed; Packaging Type: Box; Thread Size: 11/16 in -20 Single Oversize; Head Size (SAE/Metric): 1 In |
| 1956 | Buick | Roadmaster | N/A | 11/16 In. x 20 Single Oversized Thread; Shank Length (In): 0.563 in; Package Quantity: 5; Dorman - AutoGrade - Boxed; Packaging Type: Box; Thread Size: 11/16 in -20 Single Oversize; Head Size (SAE/Metric): 1 In |
| 1955 | Buick | Century | N/A | 11/16 In. x 20 Single Oversized Thread; Shank Length (In): 0.563 in; Package Quantity: 5; Dorman - AutoGrade - Boxed; Packaging Type: Box; Thread Size: 11/16 in -20 Single Oversize; Head Size (SAE/Metric): 1 In |
| 1955 | Buick | Roadmaster | N/A | 11/16 In. x 20 Single Oversized Thread; Shank Length (In): 0.563 in; Package Quantity: 5; Dorman - AutoGrade - Boxed; Packaging Type: Box; Thread Size: 11/16 in -20 Single Oversize; Head Size (SAE/Metric): 1 In |
| 1954 | Buick | Century | N/A | 11/16 In. x 20 Single Oversized Thread; Shank Length (In): 0.563 in; Package Quantity: 5; Dorman - AutoGrade - Boxed; Packaging Type: Box; Thread Size: 11/16 in -20 Single Oversize; Head Size (SAE/Metric): 1 In |
| 1954 | Buick | Roadmaster | N/A | 11/16 In. x 20 Single Oversized Thread; Shank Length (In): 0.563 in; Package Quantity: 5; Dorman - AutoGrade - Boxed; Packaging Type: Box; Thread Size: 11/16 in -20 Single Oversize; Head Size (SAE/Metric): 1 In |
| 1954 | Buick | Skylark | N/A | 11/16 In. x 20 Single Oversized Thread; Shank Length (In): 0.563 in; Package Quantity: 5; Dorman - AutoGrade - Boxed; Packaging Type: Box; Thread Size: 11/16 in -20 Single Oversize; Head Size (SAE/Metric): 1 In |
| 1953 | Buick | Roadmaster | N/A | 11/16 In. x 20 Single Oversized Thread; Shank Length (In): 0.563 in; Package Quantity: 5; Dorman - AutoGrade - Boxed; Packaging Type: Box; Thread Size: 11/16 in -20 Single Oversize; Head Size (SAE/Metric): 1 In |
| 1952 | Buick | Roadmaster | N/A | 11/16 In. x 20 Single Oversized Thread; Shank Length (In): 0.563 in; Package Quantity: 5; Dorman - AutoGrade - Boxed; Packaging Type: Box; Thread Size: 11/16 in -20 Single Oversize; Head Size (SAE/Metric): 1 In |
| 1951 | Buick | Roadmaster | N/A | 11/16 In. x 20 Single Oversized Thread; Shank Length (In): 0.563 in; Package Quantity: 5; Dorman - AutoGrade - Boxed; Packaging Type: Box; Thread Size: 11/16 in -20 Single Oversize; Head Size (SAE/Metric): 1 In |
| 1950 | Buick | Roadmaster | N/A | 11/16 In. x 20 Single Oversized Thread; Shank Length (In): 0.563 in; Package Quantity: 5; Dorman - AutoGrade - Boxed; Packaging Type: Box; Thread Size: 11/16 in -20 Single Oversize; Head Size (SAE/Metric): 1 In |
* Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
This part directly replaces or is cross-referenced with the following part numbers:
77-30SK7801-A
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.