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Engine Oil Separator O-Ring (18.5x4mm)

Engine Oil Separator O-Ring (18.5x4mm)

GENUINE PORSCHE
Availability:
Out of stock
SKU 99970763440
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$10.22 - $10.22
$10.22
$10.22 - $10.22
$10.22
CALIFORNIA WARNING

Handling passenger or off-highway motor vehicle parts can expose you to chemicals such as phthalates and lead, which can cause cancer and reproductive harm. To minimize exposure, service the vehicle in a well-ventilated area, wear gloves, and wash your hands. For more information see www.P65Warnings.ca.gov/motor-vehicle-parts.

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The Genuine Porsche Engine Oil Separator Seal part number 99970763440 / 999 707 634 40 is the perfect replacement for your Porsche’s engine oil separator seal. It is made from high-quality materials which guarantee that it will last long and provide reliable performance.

One of the benefits of using this product is that it effectively separates oil from the air that flows through your engine. This ensures that your engine remains clean and free from any harmful contaminants that can cause damage in the long run. Additionally, the Genuine Porsche Engine Oil Separator Seal part number 99970763440 / 999 707 634 40 is designed to fit perfectly in your Porsche, which means that you don’t have to worry about any compatibility issues.

The product features a durable construction which ensures that it can withstand harsh weather conditions and extreme temperatures. This makes it ideal for use in all kinds of driving conditions, whether you’re driving through hot and sunny weather or in the middle of a snowstorm.

Using the Genuine Porsche Engine Oil Separator Seal part number 99970763440 / 999 707 634 40 is easy and straightforward. Simply remove the old, worn-out seal and replace it with the new one. This ensures that your engine functions smoothly and efficiently, preventing any potential problems that could arise from a faulty oil separator seal.

Overall, if you’re looking for a reliable and high-quality engine oil separator seal for your Porsche, the Genuine Porsche Engine Oil Separator Seal part number 99970763440 / 999 707 634 40 is definitely worth considering. With its premium materials, durability and ease of use, this product is sure to deliver the performance and reliability that your car needs.

Brand Part #
Brand Part #
Porsche 999 707 634 40 / 99970763440

This part also goes by the following cross reference.

Cross Reference Part Number:

Fits These Vehicles 28 applications
Porsche
Make Model Engine Years
Porsche 911Carrera 3.4H6 2012–2016
Porsche 911Carrera 4 3.4H6 2013–2016
Porsche 911Carrera S 3.8H6 2012–2016
Porsche 911Carrera 4S 3.8H6 2013–2016
Porsche 911Targa 4 3.4H6 2014–2016
Porsche 911Targa 4S 3.8H6 2014–2016
Porsche 911Turbo 3.8H6 2014–2018
Porsche 911Turbo S 3.8H6 2014–2018
Porsche 911Carrera GTS 3.8H6 2015–2016
Porsche 911Carrera 4 GTS 3.8H6 2015–2016
Porsche 911Targa 4 GTS 3.8H6 2016–2016
Porsche 91150th Anniversary Edition 3.8H6 2014–2014
Porsche 911Turbo S Exclusive Series 3.8H6 2018–2018
Porsche 911GT2 RS 3.8H6 2018–2018
Porsche BoxsterBase 2.7H6 2013–2016
Porsche BoxsterS 3.4H6 2013–2016
Porsche BoxsterGTS 3.4H6 2015–2016
Porsche BoxsterBlack Edition 2.7H6 2016–2016
Porsche BoxsterSpyder 3.8H6 2016–2016
Porsche Boxster 3.4H6 2009–2012
Porsche Boxster 2.9H6 2009–2012
Porsche CaymanBase 2.7H6 2014–2016
Porsche CaymanS 3.4H6 2014–2016
Porsche CaymanGTS 3.4H6 2015–2016
Porsche CaymanBlack Edition 2.7H6 2016–2016
Porsche CaymanGT4 3.8H6 2016–2016
Porsche Cayman 3.4H6 2009–2012
Porsche Cayman 2.9H6 2009–2012

Fitment data last updated: 2026-10-03

Fits 28 vehicle applications Check vehicle fitment before ordering View fitment

About this Crankcase Ventilation (PCV)

The GENUINE PORSCHE 99970763440 is part of the crankcase ventilation (PCV) system, which routes gases that escape past the pistons back into the intake to be burned, and separates oil out of them. When the system fails, crankcase pressure and oil consumption can rise quickly.

Frequently asked questions

What does the crankcase ventilation system do?

It relieves pressure inside the engine by drawing blow-by gases back into the intake, while an oil separator or valve keeps oil out of the intake. Correct crankcase pressure protects seals and gaskets.

What are the signs of a failed PCV valve or oil separator?

A whistling or howling noise at idle, rough idle, lean-running fault codes, higher oil consumption, oil leaks from seals, blue smoke, or suction at the oil filler cap strong enough to hold the cap down.

What should I replace along with it?

Crankcase vent hoses become brittle with heat and age, so inspect and replace cracked hoses and fittings at the same time. On many European engines, the valve cover and separator are serviced together.

Can I replace PCV components myself?

Many parts are accessible with basic tools, though some separators sit under the intake manifold. Handle old plastic fittings carefully, as they can break during removal.

How do I make sure this crankcase ventilation part fits my car?

Compare the part numbers listed on this page with the number on your old part or in your vehicle's parts catalog, and check the fitment information. If you are unsure, contact us with your VIN before ordering.

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