Engine Oil Pressure Switch Guide for 1948-1952 Hudson Commodore Series
Keep your Hudson's oil pressure light accurate and prevent engine worries.
- A faulty oil pressure switch can give false warnings or, more dangerously, fail to warn you of a real low oil pressure problem.
- Common symptoms are a flickering or constantly lit oil light, or oil leaking from the switch itself.
- For the 1948-1952 Commodore, the available aftermarket Standard Ignition (PS16) switch is a reliable and recommended replacement.
- Replacement is a simple, inexpensive DIY task that is critical for protecting your Hudson's engine.
Is Your Hudson's Oil Light Acting Up?
The oil pressure switch is a small, inexpensive part that can cause big headaches. Because these cars are over 70 years old, the original switch is a common failure point. Symptoms often seem alarming, but the fix is usually simple. Knowing the signs of a bad switch can save you from unnecessary worry and help you distinguish between a simple electrical issue and a true engine emergency.
Symptoms of a Failing Oil Pressure Switch
- Flickering Oil Light: The red oil light on the dash may flicker, especially at idle or as engine RPMs change. This can be caused by an internally failing switch, a loose wire, or actual low oil pressure.
- Oil Light Stays On: The light may stay on constantly, even when you know the oil level is correct and the engine sounds healthy. This often means the switch is stuck in the 'on' position.
- Oil Light Never Comes On: A very dangerous symptom is when the oil light fails to turn on for a moment when you first turn the key, before starting the engine. This indicates the switch or bulb has failed and will not warn you if a real problem happens.
- Visible Oil Leaks: The switch itself can develop cracks in its body or have a failed seal, causing engine oil to leak from the sensor.
Choosing the Right Aftermarket Part
For a vintage vehicle like the 1948-1952 Hudson Commodore, finding new old stock (NOS) OEM parts is nearly impossible. The aftermarket is the primary source for new replacement parts.
Standard Ignition (Standard Motor Products): The main brand available for this part is Standard Ignition, part number PS16. Standard Motor Products (SMP) is a long-established American company known for making reliable electrical components for a huge range of vehicles, including classic cars. Their switches are manufactured to meet or exceed original specifications and use quality materials like high-temperature diaphragms to resist leakage and failure. For a simple but critical part like an oil pressure switch, a new component from a reputable brand like Standard is a much safer bet than a used, 70-year-old original.
Estimated Cost Comparison
| Part Type | Price Range |
|---|---|
| New OEM | Not Available |
| New Aftermarket (Standard PS16) | $12.56 - $14.98 |
| Used OEM | $5 - $20 (Not Recommended) |
| Shop Labor | $50 - $100 |
Frequently Asked Questions (FAQ)
Can I replace the oil pressure switch myself?
Yes, this is a very simple DIY job for most owners. The switch is located on the engine block, often near the oil filter. It typically requires unplugging a single wire and unscrewing the old switch with a standard wrench or a special oil pressure switch socket. The entire process usually takes less than 30 minutes.
Is an oil pressure switch the same as an oil pressure sender?
No. An oil pressure switch, like the one in your Commodore, is a simple on/off device for a warning light. An oil pressure sender or sending unit is for a variable gauge that shows the actual pressure reading. They are not interchangeable.
What if my oil light is on, but the oil level is full?
If the oil level is correct and the engine is not making any unusual noises (like knocking or clattering), the most likely cause is a faulty oil pressure switch or a wiring issue. However, you should always confirm the actual oil pressure with a mechanical gauge before driving the vehicle to be certain it is not a more serious problem, like a failing oil pump.
What happens if I ignore a bad oil pressure switch?
Ignoring it is a major risk. If the switch has failed and cannot light up, it will not warn you of a real low-pressure event, which can lead to catastrophic engine failure. If it's stuck on, you might get used to seeing the light and ignore it if a real problem develops. Given the low cost of the part, it should be replaced immediately if it's suspected to be faulty.
Technical Specifications
OEM Part Numbers: 2256800 2580446 2585100 2585110 3004105
Part Number: PS16, Terminal Type: Butt/Stud, Thread Size: 3/8-18 NPT
We Have This Part in Stock
The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.