# MotoRad MG146 Engine Coolant Thermostat Seal for 1986-1991 Buick Riviera

### Specifications

Inside Diameter: 1.02"

Material: Rubber

Mounting Hole Quantity: 0

Outside Diameter: 1.45"

Style: Molded

Thickness: 0.16"

Type: Thermostat Seal

### Features

-   Made of High quality materials
-   Resistance to high tempertures
-   Provide long lasting seal
-   Adhesive backed
-   Reduced and easy installation

### Product Details

Engine Coolant Thermostat Seal (MG146) by MotoRad®. MotoRad seals and gaskets are made from high quality materials suitable for resistance to high temperatures and engine coolant to maintain a superior, long lasting seal.

MotoRad offers an extensive line of adhesive backed thermostat gaskets and rubber seals to support thermostat installation. MotoRad's thermostat gaskets are made from high quality materials suitable for resistance to high temperatures and engine coolant to maintain a good seal. The adhesive backing also reduces installation time by ensuring proper alignment and ease of installation. MotoRad's thermostat seals are precision designed and made from high quality rubber products ensuring an accurate fit and durability for a long lasting seal. When a thermostat requires a single seal for all of its applications, MotoRad includes the seal with the thermostat to service the complete job and ensure customer satisfaction. Also, a seal will be included when precise alignment of the seal to the thermostat is required. This is a benefit to the DIY customer and the professional installer, as this information may only be known by the OEM through service bulletins.

Brand: MotoRad

Part Number: MG146

UPC: 055644991467

### Vehicle Fitment Table

Year

Make

Model

Position

Fitment Precision

Note

1988

Buick

Riviera

1989

Buick

Riviera

1990

Buick

Riviera

1988

Oldsmobile

Eighty-Eight

1989

Oldsmobile

Eighty-Eight

1990

Oldsmobile

Eighty-Eight

1988

Oldsmobile

Ninety-Eight

1989

Oldsmobile

Ninety-Eight

1990

Oldsmobile

Ninety-Eight

1986

Oldsmobile

Toronado

1987

Oldsmobile

Toronado

1988

Oldsmobile

Toronado

1989

Oldsmobile

Toronado

1990

Oldsmobile

Toronado

1988

Pontiac

Bonneville

1989

Pontiac

Bonneville

1990

Pontiac

Bonneville

1991

Pontiac

Bonneville

### FAQ

**Will this fit my vehicle?**  
Please verify your year, make, model, position, and any fitment notes using the Vehicle Fitment Table above before purchase.

**What part number is this?**  
The listed part number is MG146.

**Is this product designed for direct replacement?**  
Yes. This product is intended to match the compatible vehicle applications listed in the fitment table.

**Should I confirm fitment before ordering?**  
Yes. Always compare your original part, position, and vehicle details with the fitment table before ordering.

### Common Searches

-   Engine Coolant Thermostat Seal for Buick Riviera
-   MG146 fitment
-   MotoRad Engine Coolant Thermostat Seal
-   1988 Buick Riviera Engine Coolant Thermostat Seal

## Details

- **Price:** 1.43 CAD
- **Vendor:** MotoRad
- **Type:** Engine Coolant Thermostat Seal
- **Tags:** 1986-1990 Oldsmobile Toronado, 1988-1990 Buick Riviera, 1988-1990 Oldsmobile Eighty-Eight, 1988-1990 Oldsmobile Ninety-Eight, 1988-1991 Pontiac Bonneville, Automotive, Engine Coolant Thermostat Seal, MG146, MotoRad

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 1.43 CAD | In stock |

## Images

- MotoRad MG146 Engine Coolant Thermostat Seal for 1986-1991 Buick Riviera

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> Source: [Standard Auto Part](https://www.standardautopart.com/products/motorad-mg146-engine-coolant-thermostat-seal)
> Updated: 2026-08-17