AC Delco ACDER44XLS Iridium Spark Plug, Interchange NGK GR4 / BPR5ES

The AC Delco ACDER44XLS is an iridium spark plug built for dependable cold starts, quick acceleration, and smooth engine performance. Its iridium tip construction provides outstanding strength and high temperature resistance, while a copper core delivers strong heat transfer to help maximize plug durability over time. The electrode is laser-welded for a secure, long-lasting bond that resists loosening under heat cycling and vibration. Together these materials let the ACDER44XLS hold up to sustained high-temperature operation without sacrificing ignition consistency.

This spark plug is designed as a direct interchange for NGK GR4 and NGK BPR5ES plugs, making it a straightforward swap for engines currently running those part numbers. AC Delco is a long-established plug manufacturer, and the ACDER44XLS reflects that engineering in a compact, easy-to-install package suited for routine maintenance or full ignition tune-ups.

Specifications

• Brand: AC Delco
• Manufacturer Part Number: ACDER44XLS
• Type: Iridium spark plug
• Electrode Material: Iridium tip with copper core
• Construction: Laser-welded electrode
• Weight: 0.1 pounds
• UPC: 808709586494

Replaces (OEM)

• NGK GR4
• NGK BPR5ES

Frequently Asked Questions

What is the AC Delco ACDER44XLS spark plug made of? The ACDER44XLS uses an iridium tip for strength and high temperature resistance, paired with a copper core that provides strong heat transfer to help maximize plug durability.

Does the ACDER44XLS interchange with NGK spark plugs? Yes, the AC Delco ACDER44XLS is interchangeable with NGK GR4 and NGK BPR5ES spark plugs.

How much does the ACDER44XLS spark plug weigh? It weighs 0.1 pounds.

Will this spark plug improve cold starting? Reliable cold starting is one of the key benefits of the iridium construction used in the AC Delco ACDER44XLS.

Is the electrode welded or crimped on the ACDER44XLS? The electrode on the AC Delco ACDER44XLS is laser-welded, which helps it hold up under heat and vibration over time.

What is the UPC for the AC Delco ACDER44XLS spark plug? The UPC for the AC Delco ACDER44XLS spark plug is 808709586494.

Is the ACDER44XLS a genuine AC Delco part? Yes, the ACDER44XLS is a genuine AC Delco iridium spark plug, not a generic aftermarket copy.

What performance benefits does iridium construction offer over standard plugs? Iridium construction on the AC Delco ACDER44XLS offers a high melting point, reliable cold starting, quick acceleration, and smooth engine performance.

Can the ACDER44XLS replace an NGK BPR5ES plug directly? Yes, the AC Delco ACDER44XLS is listed as a direct interchange for the NGK BPR5ES.

Does the copper core affect heat transfer? The copper core in the ACDER44XLS provides great heat transfer, which helps maximize the plug's durability.