Oil thermostat housing. Porsche 911S / Carrera 2.7L 1973 › 91110701500

Oil Pipe – Engine to Oil Thermostat

The Porsche 911 Oil Pipe connects the engine oil system to the oil thermostat, allowing engine oil to flow correctly through the external oil cooling circuit. This pipe is an important part of the Porsche 911 dry-sump lubrication system, helping route hot engine oil towards the thermostat before it is directed to the front oil cooler when required.

Fits:

• Porsche 911 1984-1986 3.2L
• Porsche 911 1987-1989 3.2L G50

Diagram Ref No 9

On air-cooled Porsche 911 models, correct oil circulation is essential for engine temperature control, lubrication, and long-term reliability. A damaged, corroded, restricted, or leaking oil pipe can reduce oil flow efficiency, cause oil loss, and compromise the cooling performance of the engine oil system.

This replacement oil pipe is ideal for Porsche 911 maintenance, restoration, engine rebuilds, and oil cooling system repairs.

What Does This Oil Pipe Do?

The oil pipe transfers oil from the engine towards the oil thermostat. The thermostat regulates whether oil is sent through the external oil cooler circuit, depending on operating temperature. When the engine oil reaches the correct temperature, the thermostat opens and allows oil to circulate through the cooler system, helping maintain stable engine temperatures.

A properly functioning oil pipe helps:

• Maintain correct oil flow from the engine to the thermostat
• Support efficient oil temperature regulation
• Protect the engine from overheating
• Preserve lubrication performance
• Keep the Porsche 911 dry-sump oil system operating as intended

Why Does This Oil Pipe Fail?

Porsche 911 oil pipes are exposed to heat, road debris, moisture, vibration, and oil system pressure. Over time, these conditions can cause deterioration, especially on older air-cooled models.

Common reasons for failure include:

• Corrosion on exposed metal pipe sections
• Damage from road debris or impact
• Cracked or weakened joints
• Oil leaks from ageing connections
• Seized or damaged fittings during removal
• Internal restriction caused by debris or old oil deposits
• Previous poor repairs or incorrect installation

Because these oil pipes are part of a high-temperature, high-use lubrication system, even minor leaks or restrictions should be treated seriously.

When Should You Replace It?

Replace the oil pipe if you notice visible corrosion, oil leaks, damaged pipework, crushed sections, poor fitting condition, or oil residue around the thermostat or engine connections.

Replacement is also recommended during:

• Engine removal or rebuild work
• Oil thermostat replacement
• External oil cooler system refurbishment
• Full restoration projects
• Preventative maintenance on ageing oil lines
• Repair of leaking or seized oil pipe fittings

Replacing the pipe before complete failure helps prevent oil loss, poor cooling performance, and potential engine damage.

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

93010774315

The product you are viewing cross references to these numbers

Oil pipe engine to thermostat.

Fits:
Porsche 911 2.7L 1975-77
Porsche 911 3.0L 1978-83

Click 'Zoom in' for large parts diagram.
Diagram Ref No 9.

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

91110774312

The product you are viewing cross references to these numbers

Oil pipe oil tank to thermostat.

Fits:
Porsche 911 3.0L 1974-83
Porsche 911 3.2L 1984-89

OE Part numbers
- 91110773010
- 91110773011

Click 'Zoom in' for large parts diagram.
Diagram Ref No 17.

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

91110773013

The product you are viewing cross references to these numbers

Oil thermostat. Fits to oil lines

Fits:
Porsche 911 1974-89

Click 'Zoom in' for large parts diagram.
Diagram Ref No 1.

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

93010701701

The product you are viewing cross references to these numbers