Denso 5285 -

If your engine has been running poorly for a long time, new Denso 5285 plugs will not fix a bad coil pack, vacuum leak, or fuel injector. Diagnose underlying issues first.

Many drivers ask: "Why should I pay a premium for the 5285 when a $2 copper plug works?" The answer lies in three critical areas: performance, efficiency, and durability. denso 5285

Denso rates the Iridium Power series for up to 60,000 to 100,000 miles depending on the application. Iridium is six times harder and has a melting point 700°C higher than platinum. While copper plugs may last 20,000 miles, the 5285 is a fit-and-forget component for most daily drivers. If your engine has been running poorly for

The Denso 5285 utilizes Iridium for the center electrode and a Platinum ground electrode. However, the "TT" specifically refers to a 0.4mm tapered tip on the iridium side and a 0.7mm tapered tip on the platinum ground side. Many drivers ask: "Why should I pay a

Why the tiny taper matters:

Because the twin tips require less voltage, your ignition coils can fire the plug easier when the battery is strained in winter weather. No more sputtering on a cold morning.