Gold Plug Magnetic Engine Oil Sump Plug & Washer – MX-5 Mk1 NA / Mk2 NB / Mk4 ND • AP-08

Gold Plug AP-08 Magnetic Engine Oil Sump Plug & Washer

Premium magnetic engine oil sump drain plug upgrade for Mazda MX-5 Mk1 / NA 1.6 and 1.8, Mk2 / NB and Mk2.5 / NB-FL 1.6 and 1.8, and compatible Mk4 / ND 1.5 and 2.0 petrol models. Manufactured from CNC-machined 303 stainless steel and fitted with a powerful high-temperature neodymium magnet, this reusable sump plug helps capture ferrous metal particles circulating within the engine oil.

Gold Plug AP-08 provides a practical upgrade over a conventional non-magnetic engine oil drain plug. It replaces the existing sump plug and incorporates a magnetic tip positioned inside the engine sump, where it can attract and retain fine ferrous particles suspended in the oil.

During normal engine operation, moving metal components are continually subjected to friction, load and temperature changes. Even in a properly maintained engine, microscopic metallic particles can be generated through normal mechanical wear.

Although the engine oil filter removes many contaminants from the oil, some very fine ferrous particles may remain in circulation or settle within the sump.

The Gold Plug magnetic tip attracts compatible ferrous particles and retains them at the sump drain point, helping reduce the amount of metallic debris available to circulate through the lubrication system.

The plug uses a high-temperature N45SH neodymium magnet designed to maintain its magnetic performance in the demanding environment of an engine oil sump.

The magnet is secured within the precision-machined stainless steel plug body using Gold Plug's proprietary two-stage retention process.

The sump plug body is CNC-machined from 303 stainless steel, providing a durable, corrosion-resistant component suitable for repeated use during routine engine oil servicing.

Unlike a disposable or conventional replacement sump bolt, the magnetic Gold Plug can be retained and reused during subsequent oil changes, with the sealing washer replaced as required.

At each oil change, the magnetic tip can be wiped clean to remove any accumulated ferrous material, allowing the plug to continue collecting particles once refitted.

The AP-08 features an M14 × 1.5 thread, a 19mm hexagonal head and an approximately 20mm threaded/magnetic section. It is supplied complete with a compatible SW-02 sealing washer.

This makes the Gold Plug AP-08 particularly suitable for Mazda MX-5 owners carrying out regular engine servicing, preventative maintenance, engine refurbishment or more frequent oil changes associated with spirited road driving and track use.

Key Features & Benefits

• Premium magnetic engine oil sump drain plug upgrade
• Suitable for compatible Mazda MX-5 Mk1 / NA, Mk2 / NB and Mk4 / ND petrol engines
• Designed to capture ferrous metallic wear particles within the engine sump
• Powerful high-temperature N45SH neodymium magnet
• Durable CNC-machined 303 stainless steel plug body
• Corrosion-resistant construction
• Proprietary two-stage magnet retention process
• M14 × 1.5 threaded fitting
• 19mm hexagonal head
• Approximately 20mm threaded/magnetic length
• Reusable during future engine oil changes
• Magnetic tip can be cleaned during routine servicing
• Includes one SW-02 sealing washer
• Suitable for preventative maintenance and routine engine servicing
• Manufactured by Gold Plug in the USA

Product Specifications

• Product type: Magnetic engine oil sump drain plug
• Manufacturer: Gold Plug
• Manufacturer Part Number: AP-08
• Material: 303 stainless steel
• Magnet type: High-temperature N45SH neodymium
• Thread diameter: M14
• Thread pitch: 1.5mm
• Hex head size: 19mm
• Thread length with washer fitted: Approximately 18mm
• Thread length including magnetic tip: Approximately 20mm
• Overall plug length: Approximately 30mm
• Flange diameter: 19.9mm
• Sealing washer reference: Gold Plug SW-02
• Product finish: Stainless steel
• Fitting position: Engine oil sump drain opening
• Quantity supplied: 1 magnetic sump plug and 1 sealing washer
• Country of origin: USA
• UPC: 853871002082

How Does a Magnetic Sump Plug Work?

The magnetic tip of the Gold Plug sits inside the sump when installed. As engine oil and suspended particles move within the sump, ferrous metal particles passing sufficiently close to the magnet can be attracted and held in place.

When the oil is drained during servicing, the plug is removed and the accumulated particles can be cleaned from the magnetic tip.

The plug can then be reinstalled with a suitable sealing washer, allowing it to continue collecting ferrous debris during the next service interval.

A magnetic sump plug complements the engine's existing oil filtration system. It does not replace the oil filter, and it will not attract non-magnetic contaminants such as aluminium particles, combustion deposits or other non-ferrous material.

Fitment Advice: Gold Plug AP-08 is designed for compatible Mazda MX-5 engine oil sumps using an M14 × 1.5 drain plug with the appropriate installed length and sealing arrangement. It is suitable for the corresponding Mk1 / NA, Mk2 / NB and Mk4 / ND applications. The MX-5 Mk3 / NC uses a different sump plug specification and requires a different Gold Plug product.

Service Advice: Inspect and clean the magnetic tip during every engine oil change. A light accumulation of fine metallic residue may occur through normal engine operation. Larger metallic fragments or unusually heavy deposits can indicate abnormal internal wear and warrant further mechanical investigation.

Other Items to Consider: Engine oil, engine oil filter, replacement Gold Plug SW-02 sealing washers, oil filter removal tools and engine servicing components.

Useful Tools / Consumables: 19mm socket or spanner, calibrated torque wrench, suitable oil drain container, cleaning cloths, fresh engine oil, replacement sealing washer and appropriate vehicle lifting equipment where required.

Difficulty Guide: Easy to Moderate. Installation can be carried out during a normal engine oil change using standard workshop tools and the correct sump plug tightening procedure.

Why Gold Plug? Gold Plug specialises in premium magnetic oil drain plugs engineered to provide an additional method of capturing ferrous metallic contamination. The combination of a precision-machined 303 stainless steel body, a high-temperature neodymium magnet and a reusable design makes the AP-08 a practical engine maintenance upgrade for compatible Mazda MX-5 applications.

What's in the Box:

• 1x Gold Plug AP-08 Magnetic Engine Oil Sump Drain Plug
• 1x Gold Plug SW-02 Sealing Washer

Installation / Service Notes: Install the Gold Plug AP-08 during a scheduled engine oil change. Park the vehicle on a level surface, allow the engine to cool sufficiently and safely raise and support the vehicle where required. Position a suitable oil drain container beneath the sump and remove the existing engine oil drain plug. Allow the used oil to drain and inspect the drain plug opening and sump threads for damage. Clean the sealing surface and ensure the old sealing washer has been removed. Fit the supplied SW-02 washer to the Gold Plug AP-08 and carefully start the plug by hand to avoid cross-threading. Tighten the plug according to the applicable Mazda service specification and Gold Plug installation requirements, taking care not to overtighten the sump threads. Refill the engine with the correct specification and quantity of fresh oil. Start the engine and inspect the sump drain plug for leakage, then switch off the engine and check the oil level after the oil has settled. At future oil changes, remove the plug, clean any accumulated ferrous particles from the magnetic tip and inspect the plug and sealing washer before refitting. Dispose of used engine oil through an appropriate recycling or waste collection facility.