2015 Nissan Titan Spark Plug Type, Gap & Torque Specs

The 2015 Nissan Titan is a workhorse, powered exclusively by the robust 5.6L VK56DE V8 engine. To keep this powerhouse running smoothly, maintaining the ignition system is critical. A misfiring V8 will not only rob you of towing power and fuel economy but can also lead to unburned fuel damaging the catalytic converters. Below is your comprehensive guide to the correct spark plug types, gap settings, and torque specifications for your 2015 Nissan Titan.

Quick reference

Why the right plug matters

Modern engines are incredibly sensitive to ignition components. Choosing the correct spark plug involves more than just finding threads that fit the cylinder head. The heat range of the spark plug dictates how effectively the plug transfers heat from the firing tip to the cylinder head. If you use a plug that is too "hot," you risk pre-ignition and engine knock; if it’s too "cold," the plug will foul with carbon buildup.

Furthermore, electrode metal is a major factor. Standard copper plugs are highly conductive but wear out in just 30,000 miles. Platinum plugs extend that life significantly, but for the 2015 Nissan Titan, iridium is the OEM standard. Iridium is exceptionally hard, allowing for a fine-wire center electrode that requires less voltage to jump the gap while comfortably lasting the 105,000-mile service interval.

How to gap a spark plug

Even if you purchase "pre-gapped" iridium plugs, you should always verify the gap before installation. Shipping and handling can occasionally bump the ground strap out of specification.

1. Use the right tool: For iridium and fine-wire platinum plugs, use a wire-style feeler gauge rather than a cheap coin-style gauge. Coin gauges can easily snap the brittle fine-wire center electrode.
2. Check the gap: Slide the 0.043-inch (1.1 mm) wire between the center electrode and the ground strap. It should slide through with a slight "drag."
3. Adjust carefully: If the gap is too tight, use the bending tool on your gauge to apply a light bend to the ground strap, pulling it away from the center electrode. Never pry against the delicate center electrode itself.

Replacement procedure tips

Replacing spark plugs on the 2015 Titan's 5.6L VK56DE V8 is a straightforward coil-on-plug (COP) setup, but it requires patience.

• Clear the way: You will need to remove the engine cover and the air intake resonator tube to gain sufficient access to the coils, especially on the passenger side.
• Coil-on-Plug handling: Unbolt the 10mm fasteners holding the ignition coils. Gently twist the coil boots as you pull up to break the seal without tearing the rubber.
• The anti-seize debate: Nissan factory service manuals generally advise against using anti-seize on modern NGK spark plugs. NGK applies a special trivalent metal plating to their threads that acts as a release agent. Adding anti-seize alters the friction coefficient, which can easily lead to over-torquing and stripped aluminum cylinder head threads. Install them dry.
• Dielectric grease: Always apply a small dab of dielectric grease to the inside of the ignition coil boot before reinstalling. This prevents moisture intrusion, halts voltage leaks, and ensures the boot won't stick to the ceramic insulator during the next service.

Known issues

While the Nissan VK56DE V8 does not suffer from the infamous 2-piece spark plug breakage seen in the older Ford 3-valve V8s, it does have its own quirks. The rearmost cylinders (Cylinders 7 and 8) are tucked deep under the firewall cowl. You will need a combination of extensions and a universal joint (swivel socket) to reach them comfortably. Ensure your spark plug socket has a good rubber insert or magnetic base to grip the plug securely, preventing it from dropping into the deep spark plug tubes and cracking the porcelain insulator.

Need plugs replaced? Find a shop on Repairius.