Oil tank breather hose. Porsche 993

Oil tank breather hose.
The 99320714903 is a vent or breather hose - also referred to as an oil tank breather hose or crankcase vent hose - specifically designed for Porsche 911 “993” models. Its primary role is to equalize pressure within the oil tank and crankcase by safely channeling oil vapors and gases. This prevents excessive pressure that could cause oil leaks, foaming, or oil being forced past seals and gaskets, while also helping manage emissions by directing vapors correctly.

Fits:
Porsche 993 Carrera 2 / Carrera 4 1994 - 1997
Porsche 993 Carrera S / Carrera 4S 1994 - 1997
Porsche 993 turbo / GT2 1994 - 1997

Diagram ref no 33

Replacing this hose matters for several reasons:
•   If the hose ages, cracks, gets brittle, or is blocked, it can’t vent properly. This may lead to pressure build-up in the oil tank/crankcase
•   A faulty hose can cause oil leaks through seals or gaskets, or force oil out of vent points
•   It can lead to poor engine performance or oil foaming, which in turn risks oil starvation or damage, especially under heavy load or high temperature
•   Emissions issues may result: the engine may throw codes, or oil vapors may be vented where they shouldn’t, failing emission checks
•   For older cars, these hoses degrade over time (rubber/hoses hardened by heat, oil exposure); preventative replacement helps avoid breakdowns.

This part often supersedes earlier versions (99320714901 and 99320714902), making it the updated replacement in many cases.  

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Related, superseded, cross reference or alternative numbers for comparison.

99320714903

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