







⚡ Ignite your drive with Autolite’s double platinum power!
Autolite APP3924 Double Platinum Spark Plugs feature a necked-down copper core center electrode for faster, cleaner ignition and a platinum-to-platinum firing design that enhances durability and reduces misfires. With a Yttrium-enhanced ground electrode and high nickel alloy side electrode, these plugs maintain precise gaps and superior heat transfer, ensuring longer life and consistent engine performance. Trusted since 1936, Autolite delivers OE-quality spark plugs engineered for reliable acceleration and smoother starts.





| Brand | Autolite Iridium Ultra |
| Core Material | Copper |
| Top Material Type | Nickel |
| Vehicle Service Type | Car, Truck |
| Global Trade Identification Number | 00009100259950 |
| Automotive Fit Type | Vehicle Specific Fit |
| UPC | 009100259950 |
| Manufacturer | Autolite |
| Model | Double Platinum Spark Plug |
| Item Weight | 7 ounces |
| Product Dimensions | 5 x 1 x 5 inches |
| Item model number | APP3924-4PK |
| Is Discontinued By Manufacturer | No |
| Exterior | Chrome |
| Manufacturer Part Number | APP3924-4PK |
| Position | Center |
S**.
Amazing cost. Easy to install in the Toyota 4 cyl.
Absolutely perfect pricing. Just a few bucks a plug for high Quality Double Platinum. I have no idea how they can make these (and sell them) so cheaply. Great product, worked flawlessly in the Toyota!
B**N
Nice plug for a nice plug.
Mileage? Longevity? I just put them in yesterday. we shall see. All I know is that I installed them easily, along with new ignition coils, and the car ran great as soon as I turned the key. My car had been running so rough that I was convinced the entire car was falling apart. No. I just needed new plugs and these are working quite well.
T**.
Good fit for my vehicle
Price was right. Works fine.
J**S
We'll see how they do?
I replaced the spark plugs in my 2001 Toyota Echo. The set I took out lasted about 80,000 miles. I don't believe they were properly gaped either. I have high hopes that these will do the 100,000 mile thing which would likely be the last plugs I need to install. Time will tell but these do get generally good reviews.
M**
Works Good
Noticed a smoother run on my 97' Ram 1500. Didn't really notice more power but definitely saved me a little on gas naturally. Has a little more pick up an go. But nothing crazy. Will definitely get these again.
R**Y
Very easy and fast at a great price
Love the product
L**.
Great fit
Simply satisfied. Got to my home fast. Installation was a breeze.
D**B
Seems alright
I changed my spark plugs while doing the ig ion coil pack just because I thought it should be done and these worked just fine.
Trustpilot
3 weeks ago
5 days ago