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⚡ Ignite your drive with Autolite’s copper core spark plugs — where power meets precision!
Autolite 25 Copper Resistor Spark Plugs feature a full copper core electrode for enhanced thermal conductivity, a leak-proof copper-glass seal for durability, and a resistor to reduce radio frequency interference. Designed for quick starts, better fuel economy, and smooth acceleration, these plugs are engineered with precision rolled threads and a multi-rib insulator to prevent misfires. Trusted since 1936, Autolite delivers reliable, high-performance spark plugs ideal for motorcycles and older vehicles seeking efficient ignition and lasting value.
| ASIN | B000CBQ5QA |
| Automotive Fit Type | Vehicle Specific Fit |
| Best Sellers Rank | #351,474 in Automotive ( See Top 100 in Automotive ) #2,082 in Automotive Replacement Spark Plugs |
| Brand | Autolite Iridium Ultra |
| Brand Name | Autolite Iridium Ultra |
| Compatible with Vehicle Type | Motorcycle |
| Core Material | Copper |
| Customer Reviews | 4.6 out of 5 stars 431 Reviews |
| Global Trade Identification Number | 00009100003690 |
| Included Components | 4 spark plugs |
| Item Type Name | Copper Resistor Spark Plug |
| Item Weight | 0.11 Pounds |
| Manufacturer | FRAM |
| Manufacturer Part Number | 25-4PK |
| Manufacturer Warranty Description | Lifetime Limited Warranty |
| Model Number | 25-4PK |
| Thread Size | RM |
| Top Material Type | Alloy Steel |
| UPC | 009100003690 |
| Unit Count | 4.0 Count |
| Vehicle Service Type | Motorcycle |
T**L
Great for an older vehicle
These fit great for my 95 f150 with a 302. My old girl gets better milage and power with these copper plugs vs. iridium or more expensive plugs
C**K
Good Plugs
I have a MSD Hot Ignition on my 92 GMC Yukon 4X4 Truck with a 5.7 350 so I can't use Platinum Plugs or it melts the tips off. I worked for a Big Auto parts Chain for years and tried a dozen different kinds. I've used These Fram Autolite 25 Copper Resistor Spark Plugs for years now and they work absolutely Perfect. They burn nice and grey and look almost as good as the new ones when I change them. Very Pleased with them & Truck runs Perfect👍
D**E
Good Spark Plugs for my 302
I finally replaced the plugs in my 1978 Ford after 21 years. Now it runs much better. I have used the Autolite 25 for decades. They do the job. I use them in my 1993 GMC K3500 as well. Inexpensive, no frills, no platinum snake oil, just a good spark plug.
E**Y
Worked as they should
Check the gap before installing. I dont usually gap spark plugs but the gaps on these plugs varied by quite a bit
A**R
would buy again
very pleased boxes where not all beat up. plugs in good shape. meaning brand new ... unlike some other vendors I bought from in the past thus I sent them back and got refunded I will buy from this vendor again
R**E
Good
Good price
C**Y
As described
Plugs were new as described and still working great in my 1984 Chevy 454
A**R
Great product
Great quality spark plugs, description was correct, cheaper than stores
Trustpilot
1 month ago
3 weeks ago