GReddy MD-01 Magnetic Oil Drain Plug - M12x1.25 | Toyota / Nissan / Daihatsu (23901301)

Protect your engine's internals with the GReddy MD-01 magnetic oil drain plug. Featuring a 5000 Gauss Neodymium magnet, the MD-01 captures ferrous metal particles circulating in your engine oil before they can cause wear to bearings, journals, and other precision engine components. A simple, inexpensive upgrade that provides ongoing engine protection with every oil change.

Key Features:

• 5000 Gauss Neodymium magnet
• M12x1.25 thread pitch
• Captures ferrous metal particles from engine oil
• Direct replacement for factory drain plug
• Fits Toyota, Nissan, and Daihatsu applications
• Lightweight at 0.05 lbs
• GReddy quality and engineering

Performance Benefits:

• Engine Protection: Captures ferrous particles before they circulate through bearings and journals
• Wear Monitoring: Inspect particles on magnet at each oil change to monitor engine wear trends
• Simple Installation: Direct replacement for factory drain plug
• Ongoing Protection: Works every oil change cycle without additional maintenance
• Peace of Mind: Particularly valuable on high-mileage or modified engines

Specifications:

• Brand: GReddy
• Part Number: 23901301
• Model: MD-01
• Thread Size: M12x1.25
• Magnet Type: Neodymium
• Magnet Strength: 5000 Gauss
• Weight: 0.05 lbs

Fitment Information:

• Thread: M12x1.25 — verify your oil pan drain plug thread before ordering
• Toyota applications: Supra (JZA80, A90), Chaser, Mark II, Soarer, Aristo, and other M12x1.25 Toyota models
• Nissan applications: 240SX (S13/S14), Silvia, Skyline (R32/R33/R34), 350Z, 370Z, and other M12x1.25 Nissan models
• Daihatsu applications: Various M12x1.25 Daihatsu models
• Note: Verify your specific vehicle's drain plug thread size is M12x1.25 before ordering — common alternatives include M12x1.5 and M14x1.5
• Installation: DIY-friendly — replace at each oil change

What's Included:

• GReddy MD-01 magnetic drain plug (23901301)
• Note: New drain plug washer/gasket recommended at each installation — use OEM spec crush washer

Installation Notes:

• Drain engine oil completely
• Remove factory drain plug
• Install GReddy MD-01 with a new crush washer
• Torque to manufacturer specifications for your vehicle's oil pan
• Do not overtighten — oil pan threads can be damaged
• At each subsequent oil change, remove plug, wipe magnet clean, inspect particles, reinstall with new crush washer

How a Magnetic Drain Plug Works:

As engine components wear, they shed microscopic ferrous (iron-based) metal particles into the engine oil. These particles circulate through the lubrication system and, if not captured, pass through bearings, journals, and other precision clearances — accelerating wear with each pass. The GReddy MD-01's 5000 Gauss Neodymium magnet is positioned at the lowest point of the oil pan, where it attracts and holds ferrous particles as oil drains past during normal engine operation. At each oil change, the particles are wiped from the magnet and discarded along with the old oil, preventing them from re-entering the fresh oil charge.

5000 Gauss Neodymium Magnet:

Neodymium magnets are the strongest type of permanent magnet available, providing significantly more magnetic force than ferrite or alnico magnets of the same size. The MD-01's 5000 Gauss rating indicates a strong magnetic field capable of attracting and retaining fine ferrous particles even in the turbulent oil environment of a running engine. This strength ensures that even very fine wear particles — which are the most damaging due to their ability to penetrate tight bearing clearances — are captured and held on the magnet rather than circulating through the engine.

Wear Monitoring — What the Particles Tell You:

One of the most valuable aspects of a magnetic drain plug is the wear monitoring information it provides. At each oil change, inspect the particles collected on the magnet before wiping it clean. A small amount of very fine, almost powdery metallic debris is normal, particularly on higher-mileage engines. A sudden increase in particle quantity, or the presence of larger metallic flakes or shavings, can indicate accelerated wear or the early stages of an internal engine problem — providing an early warning before the issue becomes catastrophic. This is particularly valuable on modified or high-performance engines where internal wear rates may be higher than stock.

M12x1.25 Thread — Verify Before Ordering:

The M12x1.25 thread size is common across many Toyota and Nissan applications, but not universal. Before ordering, verify your vehicle's oil pan drain plug thread size. The easiest way is to check your vehicle's service manual or consult a parts database with your VIN. Common alternative thread sizes include M12x1.5 (used on some Toyota and Honda applications) and M14x1.5 (used on some Nissan and Subaru applications). Using a drain plug with the wrong thread pitch will damage the oil pan threads — always verify before installation.

Replace the Crush Washer Every Time:

The oil drain plug crush washer (also called a sealing washer or gasket) is a single-use component that deforms under torque to create a leak-free seal between the drain plug and oil pan. It should be replaced at every oil change when the drain plug is removed. Reusing a crush washer can result in oil leaks, as the washer has already been deformed and may not seal correctly when reinstalled. OEM-spec crush washers are inexpensive and widely available — always install a new one with the GReddy MD-01 at each oil change.

Platform Applications:

The GReddy MD-01 in M12x1.25 is a popular upgrade across the Toyota and Nissan performance community. On the Toyota side, it fits the 2JZ-powered Supra (JZA80), Chaser, Mark II, Soarer, and Aristo, as well as the GR-powered A90 Supra and other modern Toyota performance models using M12x1.25 drain plugs. On the Nissan side, it fits the KA24DE and SR20DET-powered 240SX (S13/S14), the RB-powered Skyline (R32/R33/R34), the VQ35DE/VQ37VHR-powered 350Z and 370Z, and other Nissan performance platforms. Always verify your specific application's thread size before ordering.

Why GReddy?

GReddy (Trust Co., Ltd.) is one of Japan's most respected performance parts manufacturers, with a heritage spanning decades of motorsport and street performance development. Known for their turbocharger systems, intercoolers, exhaust systems, and engine management products, GReddy's attention to detail and quality extends to even their smallest components. The MD-01 magnetic drain plug reflects GReddy's philosophy of providing meaningful performance and protection upgrades at every level of the build.

Perfect For:

• Toyota Supra, Chaser, Soarer, and Aristo builds with M12x1.25 oil pan drain plugs
• Nissan 240SX, Silvia, Skyline, 350Z, and 370Z builds wanting engine oil protection
• Any M12x1.25 Toyota, Nissan, or Daihatsu application wanting magnetic drain plug protection
• High-mileage or modified engines where monitoring wear particles is valuable
• Anyone wanting simple, effective engine protection at every oil change

Perfect For: Toyota and Nissan performance builds with M12x1.25 oil pan drain plugs seeking GReddy MD-01 magnetic drain plug for ferrous particle capture and engine wear protection.

Pro Tip: Photograph the particles on the magnet at each oil change — a visual record over time makes it easy to spot a sudden increase in wear debris that could indicate a developing engine problem before it becomes serious.

5000 Gauss Neodymium: M12x1.25 thread. Captures ferrous wear particles. Fits Toyota, Nissan, Daihatsu. 0.05 lbs. Replace crush washer at every oil change. Verify thread size before ordering.

Protect your engine with GReddy MD-01 — 5000 Gauss Neodymium magnet, M12x1.25 thread, direct fit for Toyota and Nissan performance platforms.