# 420431871 Sea-Doo Oil Cooler Gasket | Genuine OEM BRP Part

🔧 Product Description

  

Genuine Sea-Doo Rotax Oil Cooler Gasket - Part Number: 420431871

  

A genuine BRP formed gasket used between the oil cooler and engine lubrication housing on supported Rotax marine engines. It seals the oil and cooling interfaces disturbed during oil-cooler removal or engine-lubrication service.

  

⚙️ Key Features

  

• Genuine BRP oil-cooler sealing gasket

• Correct oil and coolant passage alignment

• Heat-, oil- and coolant-resistant material

• Single-use gasket recommended whenever the oil cooler is removed

  

🔄 Supersession & Cross Reference

  

OEM Supersession Chain:

  

• 420431871 → supersedes 420431870

• 420431870 → earlier oil-cooler gasket reference

  

OEM / Related Numbers:

  

• 420431871

• 420431870

  

Aftermarket / Verified Equivalents:

  

• SBT replacement oil-cooler gasket/O-ring family cross-referencing 420431870 and 420431871

• Aftermarket gasket must match the exact Rotax oil-cooler casting

  

🚤 Compatibility

  

Commonly used on:

  

• Spark and Spark Trixx 900 ACE model families

• GTI 90 with the 900 ACE engine

• Selected later Rotax 900 and 1630 lubrication systems whose diagram specifies 420431871

  

Typically suits:

  

• HP Range: Approximately 60-325 HP where the specified oil-cooler arrangement is used

• Engine / Drive Type: Rotax ACE/4-TEC engine lubrication and oil-cooling system

• Year Range: Approximately 2014 onward, engine revision dependent

• Serial / Model Identification: Confirm the complete model, engine type and oil-cooler diagram. Adjacent oil-system gaskets can appear similar but have different passage layouts.

  

🔌 Function

  

Seals the oil-cooler mounting joint so pressurised engine oil and cooling fluid remain inside their intended passages.

  

Common signs replacement or service is required:

  

• Engine oil or coolant seeps around the oil cooler

• Oil and coolant cross-contamination

• Gasket is hardened, torn or compressed

• Leak begins after the oil cooler has been removed

  

📦 Condition

  

• Genuine Sea-Doo / BRP OEM part

• Brand new

• Supplied in genuine BRP or equivalent protective packaging

## Details

- **Price:** 20.2 AUD
- **Vendor:** Seadoo
- **Tags:** Sea-Doo Parts | Jet Ski Parts & Accessories

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 20.20 AUD | In stock |

## Images

- 420431871 Sea-Doo Oil Cooler Gasket | Genuine OEM BRP Part

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/420431871-oil-cooler-gasket)
> Updated: 2026-08-01