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Oil tank breather hose. Porsche 993 Carrera 2 / Carrera 4 / RS / C2S / C4S  ›  99320715002

Oil tank breather hose. Porsche 993 Carrera 2 / Carrera 4 / RS / C2S / C4S - 99320715002
5
Check vehicle fitment
99320715002/1
Product Information
Product Information

OE Match oil tank ventilation hose for the Porsche 993, including Carrera 2 and Carrera RS applications from 1996 onwards. It replaces the hose identified as 99320715002 in the supplied oil tank assembly information.

Fits

  • Porsche 993 Carrera 2 - 1996 onwards
  • Carrera RS - 1996 onwards

Check fitment for your specific vehicle (model, year, engine) before ordering.

Diagram ref no: 37

What This Product Does

This hose forms part of the oil tank breathing circuit, providing a passage for gases and oil vapour. An intact, unobstructed connection supports ventilation without allowing vapour or oil mist to escape through damaged hose walls.

Functions

  • Provides a passage within the tank ventilation circuit.
  • Contains vapour along the intended hose route.
  • Connects the associated breather fittings.

Technical Details

  • Supplied part reference: 99320715002.
  • Brand: OE Match.
  • Assembly identification: oil tank lines 993 1994-98.
  • Engine/model notation supplied with the diagram: M64.20/21/22M64.23/24.

Symptoms of Fault

  • Visible splitting, hardening or deterioration of the hose.
  • Oily residue near the hose ends or surrounding fittings.
  • A softened or collapsed hose section.
  • Hissing near a leaking breather connection.

Why Replacement Matters

A deteriorated hose can interrupt the intended ventilation path or allow leakage. Renewing a confirmed faulty component addresses that defect; inspect neighbouring hoses, retaining clips and connection points during the same repair. OE Match focuses on Porsche replacement applications, using original references and vehicle specifications to guide component selection.

FAQs

  • Does exhaust smoke prove this hose has failed?
    No. Smoke has several possible causes, so inspect the ventilation circuit and establish the fault before replacing components.
  • Should nearby hoses also be renewed?
    Check their condition first. Similar exposure to heat and oil vapour can leave adjoining hoses hardened or damaged.
  • What should be checked before fitting?
    Confirm the vehicle application, compare the original reference and examine the mating fittings and retaining hardware.


Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

99320715002
99320715002

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The crankcase housing breather line is a key component of the engine crankcase ventilation system, designed to route blow-by gases from the crankcase back into the intake system. This process helps regulate internal engine pressure and ensures proper recirculation of gases for improved efficiency and emissions control.
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Diagram Ref No 4
What This Product Does:

  • Channels blow-by gases from the crankcase to the intake system
  • Regulates internal engine pressure
  • Prevents buildup of harmful gases within the engine
  • Supports efficient combustion and emissions control

Symptoms Of Wear Or Failure:
  • Oil leaks or residue around the breather line
  • Cracked or brittle hose material
  • Increased oil consumption
  • Rough idle or engine performance issues
  • Whistling noises caused by vacuum leaks
  • Check engine light related to ventilation system faults

Why Replacement Matters:
  • Ensures correct crankcase pressure regulation
  • Prevents oil leaks and vacuum leaks
  • Maintains proper airflow and combustion efficiency
  • Reduces emissions and oil consumption
  • Protects engine components from pressure-related damage


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Breather Line Cylinders 3-4.

The breather line for cylinders 3–4 is an integral component of the engine crankcase ventilation (PCV) system, designed to channel blow-by gases from specific cylinders back into the intake system. This process helps maintain proper pressure within the engine while reducing emissions and ensuring efficient combustion.

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Diagram Ref No 2

What This Product Does:
  • Channels blow-by gases from cylinders 3–4 into the intake system
  • Maintains proper crankcase pressure balance
  • Supports efficient combustion and emissions control
  • Prevents buildup of harmful gases within the engine

Symptoms Of Wear Or Failure:
  • Cracked, brittle, or damaged hose
  • Oil leaks or residue around the breather line
  • Rough idle or engine running issues
  • Whistling noises caused by vacuum leaks
  • Increased oil consumption
  • Check engine light related to ventilation system faults

Why Replacement Matters:
  • Ensures correct crankcase pressure and airflow
  • Prevents vacuum leaks and oil leaks
  • Maintains optimal combustion and engine performance
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  • Protects engine components from pressure-related damage



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