---
id: 20261005_160000_stant-27271-mercedes-benz-300sdl-1986-1987
title: Stant 27271 Thermostat Seal for Mercedes-Benz 300SDL (1986–1987)
category: Parts Catalog
corpus_topic: PartsCatalog
site_category: Parts Catalog
summary: Stant 27271 thermostat seal (Gates 33613), fitting the Mercedes-Benz 300SDL (1986–1987) 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 Mercedes-Benz 300SDL (1986–1987) 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 Mercedes-Benz 300SDL, and who can I buy it from?
keypoints:
- Mercedes-Benz 300SDL (1986–1987)
- 'Engines listed: 6-Cyl. 3.0L Diesel'
- 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
- mercedes-benz
- mercedes-benz-300sdl
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
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pipeline_filename: stant-27271-mercedes-benz-300sdl-1986-1987.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
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predicted_narrative_arc: owner-searching-to-part-found
share_url: https://donsobsoleteautoparts.com/kb/PartsCatalog/stant-27271-mercedes-benz-300sdl-1986-1987.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: Mercedes-Benz 300SDL
---

# Stant 27271 Thermostat Seal for Mercedes-Benz 300SDL, 1986–1987

Mercedes-Benz built its name on cars engineered to last, and its gas and diesel engines from the 1960s through the 1980s often run for hundreds of thousands of miles. On the Mercedes-Benz side, Stant's catalog lists the 27271 for 43 models from 1959 to 1993.

This page is for one model only: the Mercedes-Benz 300SDL. It isn't a wall of every car ever made, just yours.

## Model this seal fits

- Mercedes-Benz 300SDL (1986–1987)
- 6-Cyl. 3.0L Diesel: 1986–1987

## 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

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.**