---
product_id: 29121327
title: "Autolite Iridium XP Automotive Replacement Spark Plugs, XP3923 (4 Pack)"
brand: "autolite iridium ultra"
price: "$57.76"
currency: USD
in_stock: true
url: https://www.desertcart.us/products/29121327-autolite-iridium-xp-automotive-replacement-spark-plugs-xp3923-4-pack
store_origin: US
region: United States of America
---

# Up to 100,000 miles extended change interval V-trimmed ground electrode for sharper ignition 0.6mm finewire iridium tip for max fuel efficiency Autolite Iridium XP Automotive Replacement Spark Plugs, XP3923 (4 Pack)

**Brand:** autolite iridium ultra
**Price:** $57.76
**Availability:** ✅ In Stock

## Summary

> ⚡ Ignite Performance, Drive Efficiency — Don’t Get Left Behind!

## Quick Answers

- **What is this?** Autolite Iridium XP Automotive Replacement Spark Plugs, XP3923 (4 Pack) by autolite iridium ultra
- **How much does it cost?** $57.76 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/29121327-autolite-iridium-xp-automotive-replacement-spark-plugs-xp3923-4-pack)

## Best For

- autolite iridium ultra enthusiasts

## Why This Product

- Trusted autolite iridium ultra brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Trusted Heritage:** Backed by Autolite’s legacy since 1936, delivering reliable OE-quality performance every time.
- • **Precision Ignition:** 0.6mm finewire iridium centerwire with laser welding ensures consistent, focused sparks for optimal fuel burn.
- • **Unmatched Longevity:** Engineered to last up to 100,000 miles, reducing maintenance frequency and cost.
- • **Advanced Construction:** Platinum-protected ground wire and V-trimmed electrode optimize ignition across all engine types, including DIS systems.
- • **Enhanced Fuel Economy:** Finewire electrodes maximize ignitability, helping you squeeze more miles per gallon.

## Overview

Autolite Iridium XP spark plugs combine cutting-edge 0.6mm iridium finewire technology with a durable platinum-protected design to deliver up to 100,000 miles of reliable, fuel-efficient ignition. Trusted since 1936, these plugs offer superior ignitability and optimal engine performance for both domestic and foreign vehicles, backed by a limited lifetime warranty.

## Description

Autolite Iridium XP Automotive Replacement Spark Plugs, XP3923 (4 Pack)

## Features

- EXTENDED CHANGE INTERVAL: The Autolite Iridium XP automotive replacement spark plug is engineered to last for up to 100,000 miles depending on engine type making it one of the most durable spark plugs on the market today
- FUEL EFFICIENCY: These spark plugs utilize a 0.6mm finewire iridium centerwire tip design with laser welded technology for maximum fuel efficiency. Our finewire electrodes produce more focused and consistent ignitability resulting in less fuel consumption
- OPTIMAL PERFORMANCE: This replacement iridium spark plug provides better durability and a more focused ignition for better overall ignitabilty and optimal performance
- AUTOLITE ADVANTAGE: Autolite has been producing spark plugs since 1936 making it one of the most trusted and reliable brands for your OE replacement spark plug needs
- CONSTRUCTION: Every iridium spark plug comes with a platinum protected ground wire for maximum efficiency in all ignition types including DIS systems and a V-trimmed ground electrode for improved ignitability

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Brand | Autolite Iridium Ultra |
| Core Material | Iridium |
| Thread Size | 5/8" |
| Top Material Type | Alloy Steel |
| Vehicle Service Type | Car, Truck |
| Global Trade Identification Number | 00009100044334 |
| Automotive Fit Type | Vehicle Specific Fit |
| UPC | 009100044334 |
| Manufacturer | FRAM |
| Model | XP3923-4PK |
| Item Weight | 6.7 ounces |
| Product Dimensions | 3.38 x 4 x 1 inches |
| Item model number | XP3923-4PK |
| Is Discontinued By Manufacturer | No |
| Exterior | Chrome |
| Manufacturer Part Number | XP3923-4PK |
| Position | Center |
| Special Features | Finewire design, Limited Lifetime Warranty |

## Product Details

- **Brand:** Autolite Iridium Ultra
- **Core Material:** Iridium
- **Thread Size:** 5/8"
- **Top Material Type:** Alloy Steel
- **Vehicle Service Type:** Car, Truck

## Images

![Autolite Iridium XP Automotive Replacement Spark Plugs, XP3923 (4 Pack) - Image 1](https://m.media-amazon.com/images/I/71zUj4JgPFL.jpg)

## Available Options

This product comes in different **Size** options.

## Questions & Answers

**Q: where does one find a 3/8 inch spark plug socket socket? I can only find 5/8 inch and larger.**
A: Unless these are somehow the tiniest spark plugs in existence, you do not need a 3/8” socket. 5/8” will be the correct socket size and 3/8” will be the size of the ratchet attachment on the other end of the socket. 3/8” is about 10 mm which is smaller than the threads on this plug.

**Q: will this fit 2004 dodge ram 1500 4.7 liter 4x4 v8?**
A: No, these Autolite XP3923 spark plugs fit 2002-2005 Dodge Ram 1500 (3.7L). Autolite XP5224 will fit 2002-2007 Dodge Ram 1500 (4.7L V8).

**Q: Will these spark plugs fit 2003 Altima 2.5**
A: Hello,
 no these will not fit a Altima. Ngk are the original part number 6240. Please let us know if we can be of further assistance.

**Q: Where are these made?**
A: Autolite Iridium XP spark plugs are designed and engineered in the USA.  However, they are manufactured in China - as are all Autolite spark plugs.

## Frequently Bought Together

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*Product available on Desertcart United States of America*
*Store origin: US*
*Last updated: 2026-02-18*