---
id: 20261005_160000_stant-27277-oldsmobile-ninety-eight-1986-1990
title: Stant 27277 Thermostat Seal for Oldsmobile Ninety Eight (1986–1990)
category: Parts Catalog
corpus_topic: PartsCatalog
site_category: Parts Catalog
summary: Stant 27277 thermostat seal (Gates 33610), fitting the Oldsmobile Ninety Eight (1986–1990) per Stant's 1928–1994 catalog. Offered by Don and Kathy Leask of Don's Obsolete Auto Parts, restoration parts sellers online since 1997. Price is $9.95 plus $3.00 for shipping.
description: Stant 27277 thermostat seal (Gates 33610), fitting the Oldsmobile Ninety Eight (1986–1990) per Stant's 1928–1994 catalog. Offered by Don and Kathy Leask of Don's Obsolete Auto Parts, restoration parts sellers online since 1997. Price is $9.95 plus $3.00 for shipping.
question: Will the Stant 27277 thermostat seal fit my Oldsmobile Ninety Eight, and who can I buy it from?
keypoints:
- Oldsmobile Ninety Eight (1986–1990)
- 'Engines listed: V-6 3.8L'
- Same seal as Gates 33610
- Price is $9.95 plus $3.00 for shipping.
tags:
- stant
- stant-27277
- thermostat-seal
- water-outlet-seal
- restoration-parts
- obsolete-auto-parts
- oldsmobile
- oldsmobile-ninety-eight
consent: true
agent: misty
created: '2026-10-06T21:37:26Z'
updated: '2026-10-06T22:08:48Z'
date: '2026-10-05'
vault_stage: 07_CODEX
enrich_status: ok
enrich_method: bot
enrich_blockers: []
pipeline_filename: stant-27277-oldsmobile-ninety-eight-1986-1990.md
source_kind: authored
proposed_topic: PartsCatalog
lane: PartsCatalog
content_status: approved
routing_source: carbon
prefix: misty
headwaters: misty
voice: misty
active_voice: misty
voices:
- misty
asker_site: donsobsoleteautoparts.com
sample: false
sentiment: helpful
emotions:
- reassured
- nostalgic
- confident
sycophancy: 0
truth_score: 9
entropy: 3
predicted_narrative_arc: owner-searching-to-part-found
share_url: https://donsobsoleteautoparts.com/kb/PartsCatalog/stant-27277-oldsmobile-ninety-eight-1986-1990.md
source_url: ''
part_number: Stant 27277
requested_by: Kathy Leask (email 2026-10-05 3:14 PM PT, msg_0859fa0d63994b9eb5832c2c51135a79)
approved_by: 'Daniel Comp APPROVED Oct 6, 2026 ~2:24 PM PT: apply Don Leask pricing block to ALL Stant pages on DOAP and finish posting remaining seal pages'
vehicle: Oldsmobile Ninety Eight
---

# Stant 27277 Thermostat Seal for Oldsmobile Ninety Eight, 1986–1990

Oldsmobile was General Motors' comfortable middle-class car, and for many years it was America's oldest car brand. On the Oldsmobile side, Stant's catalog lists the 27277 for 5 models from 1986 to 1990.

This page is for one model only: the Oldsmobile Ninety Eight. It isn't a wall of every car ever made, just yours.

## Model this seal fits

- Oldsmobile Ninety Eight (1986–1990)
- V-6 3.8L: 1986–1990 — catalog note: 1986–1987: with 1-bolt housing

## Help choosing the right seal

The 27277 is a Stant thermostat seal, a molded rubber ring that seals the thermostat or the water outlet (thermostat housing) instead of a flat paper gasket. Its Gates equivalent, Gates 33610, is described as a molded seal, about 1.07 in. inside diameter × 1.46 in. outside diameter × 0.105 in. thick. Stant's own description of these seals: no sealer or RTV is needed for a leak-proof seal, and each one is shaped for its application. Stant made a different seal for each housing design, and Don stocks several of them, so check which number your car calls for.

Before you order, match three things: your year, your model, and your engine. Catalogs list fitment by vehicle, but some engines had more than one thermostat housing design over the years. If your old seal is still in hand, compare its size and shape, or just ask Don and Kathy. They'll help you sort it out.

## Real people behind the parts

Don and Kathy Leask have been selling obsolete and restoration auto parts online since 1997. Their eBay store, carparts2, was the second auto parts store on eBay. Over the years it grew into one of the biggest online sources of obsolete parts, with something like 11,000 to 17,000 unique parts listed.

These seals come from Don's own shelves.

## Price is $9.95 plus $3.00 for shipping.

Don and Kathy offer a fair deal for this. Buying for a club, a shop, or a whole fleet of project cars? Even better.

**To reach them, click the "Don & Kathy Leask" button at the bottom left of any page on donsobsoleteautoparts.com, or email misty@donsobsoleteautoparts.com.**