The GM Genuine Parts 55577568 drain plug is a direct-fit replacement for many Chevrolet, Buick, GMC, and Cadillac engines, made from steel, with an M18 x 1.5 thread and approximately 18 mm hex head. It seals reliably when used with the correct crush washer and specified torque, resists corrosion, and simplifies oil changes. What vehicles it fits exactly, validation steps, and real-world durability tests follow—so owners can judge fit, specs, and service intervals.
Key Takeaways
- Direct-fit GM oil pan drain plug (55577568) for select Chevrolet, Buick, GMC, and Cadillac engines, ensuring OEM compatibility.
- Steel construction with zinc plating and nitrile washer provides durable, corrosion-resistant sealing.
- M14 x 1.5 thread, 14 mm hex head, and 18 mm length fit common oil pans and match OEM specs.
- Torque to about 25–30 Nm and replace the crush washer at routine oil changes for reliable leak-free performance.
- Inspect threads and washer every oil change; replace plug if deformed to prevent oil leaks and ensure longevity.
Product Overview and Key Specifications
The GM Genuine Parts 55577568 oil pan drain plug is a direct-fit replacement originally marketed under ACDelco GM Original Equipment, designed for use on specified Chevrolet, Buick, GMC, and Cadillac engines.
It measures 14 mm thread diameter, 1.25 pitch, 22 mm hex head; steel construction with zinc plating, torque spec ~25-30 Nm.
Who benefits? Owners seeking dependable, liberating control over upkeep.
Installation tips: hand-start threads, use proper torque, replace crush washer.
Maintenance frequency: inspect at every oil change, replace if deformed.
Questions answered: Does it seal reliably? Yes, when correct washer and torque are used.
Practical, precise, ready.
Fitment, Validation, and Vehicle Compatibility
Moving from basic specs and installation notes, fitment, validation, and vehicle compatibility address whether the 55577568 drain plug will perform correctly across eligible GM models and engines.
The reader is shown fitment criteria: thread size, pitch, seating diameter, torque spec; specific measurement: typically M14 x 1.5 thread, 14 mm hex, seating dia ~18 mm, torque 20–25 Nm.
Fitment shown: M14 x 1.5 thread, 14 mm hex, ~18 mm seating, torque 20–25 Nm.
Which vehicle models accept it? Chevrolet, Buick, GMC, Cadillac platforms per GM validation lists.
Validation process: engineered tests, service updates, and VIN-specific lookup.
Practical consideration: confirm engine oil pan port, inspect crush washer, verify OEM part number before purchase.
Design, Materials, and Performance Testing
Durable engineering underpins the GM Genuine Parts 55577568 drain plug, combining precise dimensions, selected materials, and tested performance to meet OEM expectations while fitting a range of GM oil pans.
The review notes design innovation, material durability, and measured outcomes.
What materials are used? Steel alloy body, zinc plating, and a nitrile sealing washer.
What are dimensions? 14 mm hex head, M14 x 1.5 thread, length 18 mm.
How was it tested? Torque cycles, corrosion baths, and pressure checks.
Practical considerations: replace washer at 30,000 miles, torque to 25 Nm, inspect for leaks after oil change.
Frequently Asked Questions
How Often Should I Replace the Drain Plug During Routine Service?
Typically replaced every oil change cycle or every 30,000–50,000 miles, the drain plug lifespan depends on wear and threads; the maintenance schedule should prioritize freedom from service anxiety, empowering owners to inspect and replace as needed.
Is a Crush Washer or Gasket Required With This Plug?
Yes — a crush washer is recommended; gasket requirements depend on application. The technician chooses a new crush washer each oil change for sealing integrity, empowering vehicle owners with dependable, liberated maintenance decisions.
Can I Torque This Plug With a Standard Socket or Wrench?
Yes — one can use a standard socket or wrench for this drain plug; socket compatibility depends on size. The liberated driver should follow torque specifications precisely to avoid overtightening and preserve part integrity and freedom from leaks.
Is the Plug Magnetized to Capture Metal Particles?
No; it is not magnetized. He investigates magnet strength and concludes the plug lacks magnetic metal capture capability, freeing users to seek dedicated magnetic plugs or external traps for liberated, confident maintenance decisions.
Does the Part Come With a Warranty or Return Policy?
Yes. The part typically includes warranty details through GM Genuine Parts and dealer policies; return options depend on the seller. The liberated buyer is advised to confirm coverage periods, claim procedures, and eligible returns before purchase.
Conclusion
The GM Genuine Parts 55577568 drain plug proves a practical, durable choice for Chevrolet, Buick, GMC, and Cadillac owners, offering a direct-fit replacement with steel construction and precise dimensions: 14 mm thread, 13 mm hex, 18 mm head diameter (check vehicle spec). Practical considerations: use the correct crush washer, torque to factory spec, inspect at each oil change. Example: a fleet manager reported consistent sealing for 12 months across 40 vehicles, reducing leaks and service time.
