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- Porsche 996 C2 3.4L 1997-08/01
- Porsche 996 C4 3.4L 1997-08/01
This Air/Oil Separator product ref 996.107.023.55 also includes the rubber below 996.107.237.52 and jubilee clip 999.512.551.01
The AOS is basically a small diaphragm distillery which distills the minute amounts of oil mist in the crankcase, liquifies it and sends it back to the crankcase. The "clean" air is now sent into the air intake (after the throttle body) to be burned off by the engine.
When the AOS starts to fail it cannot separate all of the oil out of the mist and some liquid oil is sent to the air intake.
A few drops of oil is enough to generate the GREAT SMOKE BOMB for which our cars are famous for.
A big smoke bomb once in a while is completely normal, due to the architecture of the flat-6 engine, which may let a drop of oil flow into one of the combustion chambers sporadically.
Fits:
- Porsche 996 C2 3.4L 1997-08/01
- Porsche 996 C4 3.4L 1997-08/01
Click pictures for large parts diagram.
Diagram Ref No 1.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99610702355
The product you are viewing cross references to these numbers
- Porsche 911 1965-1968 2.0L / 912 SWB (F)
- Porsche 356B 1959-63
- Porsche 356C 1963-65
Fits:
Porsche 356 B-T6 with European heater system,
Porsche 356C
Porsche 912
Diagram ref no 21
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
61610779201
The product you are viewing cross references to these numbers
.jpg?width=197 "Oil filler and breather. Porsche 356B / 356C - 61610707900 - 1613600400")
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- Porsche 356B 1959-63
- Porsche 356C 1963-65
This OE Match oil filler and breather is a replacement engine oil system component for Porsche 356B and 356C models. It is designed to match the original-style fitment and function, helping provide the correct oil filling point and crankcase breathing arrangement.
Fits:
Porsche 356B - 1959 to 1963
Porsche 356C - 1963 to 1965
Diagram ref no 14
The oil filler and breather assembly allows engine oil to be added to the engine while also supporting crankcase ventilation. It helps manage oil vapour and pressure within the engine, allowing the crankcase to breathe correctly as part of the engine lubrication and ventilation system.
Functions
• Replaces the oil filler and breather assembly
• Provides the engine oil filling point
• Supports crankcase ventilation and breathing
• Helps manage oil vapour and internal crankcase pressure
• Supports correct engine lubrication system operation
• Replaces damaged, corroded, blocked, leaking, or missing original assemblies
• OE Match replacement for Porsche 356B and 356C engine restoration.
Why Replace This Part?
Oil filler and breather assemblies can corrode, block, leak, become damaged, or go missing due to age, engine heat, oil vapour, moisture, and previous repairs. A faulty breather can contribute to oil leaks, poor crankcase ventilation, oil mist, pressure build-up, or an incomplete engine bay appearance. Replacing the assembly helps restore correct oil system function and original-style engine detail.
When to Replace This Part
• The oil filler or breather assembly is damaged, rusty, blocked, or missing
• Oil vapour, misting, or leakage is present around the breather area
• Crankcase ventilation is restricted or not working correctly
• The engine oil filler area is being restored
• The engine has been removed, rebuilt, or resealed
• Incorrect or non-original breather parts have been fitted
• The vehicle is undergoing Porsche 356B or 356C engine bay restoration.
Where it fits on the car
This oil filler and breather assembly fits on the engine oil filler / crankcase ventilation area on Porsche 356B and 356C models. It forms part of the engine lubrication and breathing system.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
61610707900
The product you are viewing cross references to these numbers
- Porsche 911 1965-1968 2.0L / 912 SWB (F)
- Porsche 356B 1959-63
- Porsche 356C 1963-65
This is a high-quality replacement designed for Porsche 912 and select 356 engines, engineered to meet and improve upon original factory specifications. This updated version features a thicker profile—double the OE thickness—to provide enhanced sealing performance and durability, ideal for long-term reliability.
Fits:
Porsche 356 B-T6 with European heater system,
Porsche 356C
Porsche 912
Diagram ref no 21
• Fits between the oil filler can / breather assembly and engine housing
• Direct-fit replacement with no modification required
• Please note: This gasket is no longer available from Porsche
As the original Porsche gasket is no longer available and many old units suffer from hardening or compression failure, this improved OE Match replacement provides a superior, long-lasting solution. Its increased thickness enhances sealing against surface imperfections, maintaining oil tightness and preventing seepage even under heat, pressure, and vibration.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
61610779201
The product you are viewing cross references to these numbers