---
id: 20261005_160000_stant-27271-bmw-535i-1985-1993
title: Stant 27271 Thermostat Seal for BMW 535i (1985–1993)
category: Parts Catalog
corpus_topic: PartsCatalog
site_category: Parts Catalog
summary: Stant 27271 thermostat seal (Gates 33613), fitting the BMW 535i (1985–1993) 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 27271 thermostat seal (Gates 33613), fitting the BMW 535i (1985–1993) 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 27271 thermostat seal fit my BMW 535i, and who can I buy it from?
keypoints:
- BMW 535i (1985–1993)
- 'Engines listed: 6-Cyl. 3.5L'
- Same seal as Gates 33613
- Price is $9.95 plus $3.00 for shipping.
tags:
- stant
- stant-27271
- thermostat-seal
- water-outlet-seal
- restoration-parts
- obsolete-auto-parts
- bmw
- bmw-535i
consent: true
agent: misty
created: '2026-10-05T23:40:24Z'
updated: '2026-10-05T23:40:24Z'
date: '2026-10-05'
vault_stage: 07_CODEX
enrich_status: ok
enrich_method: bot
enrich_blockers: []
pipeline_filename: stant-27271-bmw-535i-1985-1993.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-27271-bmw-535i-1985-1993.md
source_url: ''
part_number: Stant 27271
requested_by: Kathy Leask (email 2026-10-05 3:14 PM PT, msg_0859fa0d63994b9eb5832c2c51135a79)
approved_by: Daniel Comp, Grok Bot chat, 2026-10-05 4:40 PM PT
vehicle: BMW 535i
---

# Stant 27271 Thermostat Seal for BMW 535i, 1985–1993

BMW built its reputation on smooth inline engines and sporting sedans, and its cars from the 1970s through the early 1990s are now favorites with collectors and drivers alike. On the BMW side, Stant's catalog lists the 27271 for 34 models from 1971 to 1994.

This page is for one model only: the BMW 535i. It isn't a wall of every car ever made, just yours.

## Model this seal fits

- BMW 535i (1985–1993)
- 6-Cyl. 3.5L: 1985–1993

## Help choosing the right seal

The 27271 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 33613, is described as a O-ring seal, about 2.359 in. inside diameter × 2.637 in. outside diameter × 0.14 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

Back in 1997, when almost nobody had a website, Don and Kathy were already selling car parts online. They were the very first web customer of Daniel Comp's Intelligent Network. They've since sold through eBay, Bonanza, and their own site, and kept the sales coming no matter how often the internet changed its rules.

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.**