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Oil Pressure Senders / Switches
- Porsche 911 1965-1968 2.0L / 912 SWB (F)
- Porsche 356 1950-55
- Porsche 356A 1955-59
- Porsche 356B 1959-63
- Porsche 356C 1963-65
- Porsche 914 (1970-1976)
Fits:
Porsche 356 Pre A (1948 - 1955)
Porsche 356 A (1955 - 1959)
Porsche 356 B (1959 - 1963)
Porsche 356 C (1963 - 1965)
Porsche 911 F (1965 - 1969)
Porsche 914/6 (1970 - 1972)
Click 'Zoom in' for large parts diagram.
Diagram ref no 72
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99965900940
The product you are viewing cross references to these numbers
- Porsche 911 1965-1968 2.0L / 912 SWB (F)
- Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
- Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
- Porsche 911 1975-1977 3.0L Turbo (930)
- Porsche 356B 1959-63
- Porsche 356C 1963-65
- Porsche 914 (1970-1976)
Fits:
Porsche 356B / 356C
Porsche 912
Porsche 911 65-77
Porsche 914
Click 'Zoom in' for large parts diagram.
Diagram ref no 54
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99906401002
The product you are viewing cross references to these numbers
- Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
- Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
- Porsche 914 (1970-1976)
Porsche Oil Pressure Relief Valve
The oil pressure relief valve 90110728520 is an important
component in the lubrication system of classic high-performance Porsche
engines. Used in racing and motorsport-derived models such as the Porsche 911
RSR 2.8, 911 RSR 3.0 and Porsche 914-6 GT, this valve helps regulate oil
pressure to ensure safe and consistent engine lubrication.
Fits:
These engines were developed for high-performance and competition use, where maintaining stable oil pressure is critical to protecting internal engine components during high RPM operation.
What the Oil Pressure Relief Valve Does
The oil pressure relief valve regulates pressure within the engine’s lubrication system. As oil is pumped through the engine, pressure builds within the system. If the pressure exceeds a predetermined level, the relief valve opens to divert excess oil back into the system.
This process helps:
• Maintain stable oil pressure throughout the engine
• Prevent excessive pressure that could damage seals and gaskets
• Protect oil coolers and lubrication channels
• Ensure proper lubrication during high RPM operation
• Maintain reliability in high-performance engines
Without a properly functioning relief valve, oil pressure can rise beyond safe levels, increasing the risk of component failure.
Why Oil Pressure Relief Valves Fail
Over time, oil pressure relief valves can wear or become contaminated with debris from the lubrication system.
Common causes of failure include:
Internal wear
Continuous operation under high pressure can wear the internal spring or valve
seat.
Contamination
Debris or sludge in the oil system can cause the valve to stick or operate
incorrectly.
Spring fatigue
The internal spring that controls opening pressure can weaken with age.
Improper oil maintenance
Old or contaminated oil can accelerate internal wear of lubrication system
components.
Symptoms of a Faulty Oil Pressure Relief Valve
• Unstable or fluctuating oil pressure readings
• Excessively high oil pressure
• Oil leaks caused by excessive pressure
• Reduced lubrication efficiency in extreme conditions
• Potential damage to seals, oil coolers or engine components
Replacing a worn relief valve helps maintain correct oil pressure and protects valuable engine components.
Why You May Need to Replace This Valve
Protect High-Performance Porsche Engines
RSR and GT engines operate under demanding conditions where stable oil pressure
is critical.
Maintain Correct Oil System Operation
A properly functioning valve ensures the lubrication system operates within
safe pressure limits.
Prevent Engine Damage
Excessive oil pressure can damage seals, oil coolers and internal components.
Ideal for Engine Rebuilds or Restorations
When rebuilding or restoring classic Porsche racing engines, replacing critical
oil system components ensures long-term reliability.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
90110728520
The product you are viewing cross references to these numbers
- Porsche 924 2.0L 1976-79
- Porsche 924 2.0L 1980-85
- Porsche 924 Turbo 2.0L 1979-81
- Porsche 924 Turbo 2.0L 1982-84
- Porsche 924 Carrera GT 2.0L 1981
- Porsche 924 Carrera GTS 2.0L 1982
- Porsche 914 (1970-1976)
Fits:
Porsche 914 1970-76
Porsche 924 1978-85
Click 'Zoom in' for large parts diagram.
Diagram ref no 6
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
021919081D
The product you are viewing cross references to these numbers
- Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
- Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
- Porsche 911 1978-1983 3.0L / SC
- Porsche 911 1975-1977 3.0L Turbo (930)
- Porsche 914 (1970-1976)
Fits:
Porsche 911 / 912 1969-76
Porsche 911 SC SPM 1978-83
Porsche 911 Turbo 3.0L 1975-77
Porsche 914
Diagram ref no 28
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
90164163200
The product you are viewing cross references to these numbers
Engine Oil Pressure Switches & Senders – Precision Monitoring for Porsche Engines
The engine oil pressure switch or sender unit is a vital component of your Porsche’s lubrication system. Its primary role is to monitor oil pressure and send signals to your dashboard, ensuring the engine always maintains sufficient lubrication. A properly functioning oil pressure sender safeguards against engine wear, overheating, and performance loss.
At Design911, we supply a full range of oil pressure switches and sender units for classic and modern Porsche models. Built from high-quality, heat-resistant materials, these components are designed for durability, accuracy, and consistent performance under demanding driving conditions.
Whether you’re restoring a classic 911, maintaining a Cayenne, or servicing a Cayman, our oil pressure senders and switches provide dependable pressure monitoring and peace of mind every time you drive.
What Do Oil Pressure Switches & Senders Do?
Oil pressure switches and senders work together to ensure your engine has the correct oil pressure for proper lubrication.
Core Functions:
- Monitor
oil pressure in the engine’s lubrication system.
- Transmit
readings or alerts to the vehicle’s dashboard gauge or warning light.
- Protect
engine components by warning of low oil pressure.
- Ensure stable oil circulation during all driving conditions.
Accurate oil pressure monitoring prevents engine damage and maintains optimal performance, making these parts essential to Porsche reliability.
Why Do Oil Pressure Switches & Senders Fail?
Over time, exposure to heat, vibration, and oil contamination can cause pressure switches and sensors to deteriorate or malfunction.
Common Causes of Failure Include:
- Oil
contamination clogging internal diaphragms or ports.
- Electrical
corrosion or connector failure.
- Seal
degradation, leading to oil leaks.
- Wear
and tear from repeated heat cycles.
- Faulty readings due to sensor fatigue or wiring damage.
Symptoms of a failing sender include flickering oil pressure lights, inaccurate gauge readings, oil leaks, or false low-pressure warnings, all of which can compromise performance or lead to unnecessary engine risk.
Why Replace Components?
A reliable oil pressure reading is crucial for the health of your Porsche engine. Replacing worn switches or senders with precision-engineered, high-quality components ensures dependable performance, accurate readings, and long-term protection.
Key Benefits:
- Restores accurate oil pressure readings.
- Prevents false dashboard warnings.
- Protects against engine wear and overheating.
- Constructed from heat- and corrosion-resistant materials.
- Direct-fit
design for easy installation and compatibility.
- Ideal for performance maintenance, rebuilds, or upgrades.
By replacing a faulty sender or switch, you’ll preserve accurate oil pressure data and maintain the performance and longevity of your Porsche engine.
Highlights:
Precision-engineered
Porsche oil pressure senders and switches.
Reliable
oil monitoring for consistent engine protection.
Heat-
and corrosion-resistant materials for long life.
Direct-fit
compatibility for Porsche 911, Cayman, Boxster & Panamera.
Prevents
false warnings and ensures accurate oil pressure readings.
Perfect
for preventive maintenance or complete engine rebuilds.
