Are these plugs pre-gapped ?

They should be. THOUGH, and I stress, it wouldn't hurt to check them prior to installing them. I've purchased pre-gapped plugs before and they were off just a bit. 39 vs 44 as an example.

What is the expected milage for these?

40-50k miles (more expensive OE 9029 are rated 80-100k miles). Ref. ngksparkplugsdotcom

Are these 5/8 spark plugs?

These sparkplugs are 14mm or 9/16. Socket fits snug with either one you wish to go with . Strongly suggest the magnetic spark plug socket .

Will this fit a 2015 Nissan rouge sv?

Amazon site should tell if they fit.

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NGK LKAR6AIX-11 Iridium IX Spark Plug (91187 Iridium Ix), 4 Pack

Product ID: 88466429

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Details

Brand
NGK
Core Material
Iridium
Thread Size
14mm
Top Material Type
Metal
Vehicle Service Type
Racecar

⚡0.6mm laser-welded iridium tip

🔥High melting point iridium alloy

🛡️Triple gasket seal prevents gas leaks

Description

⚡ Ignite your drive with NGK Iridium IX – where precision meets performance.

FOULING NOT HERE - Extended insulator nose and corrugated ribs prevent fouling and flashover, keeping your engine clean and efficient.
LEAK PROOF POWER SEAL - Triple gasket seal locks in combustion gases, maximizing power output and engine reliability.
RACE READY DURABILITY - Iridium alloy withstands extreme heat and wear, engineered for high-performance engines that demand more.
THROTTLE RESPONSE BOOST - Optimized electrode design minimizes quenching, giving you lightning-fast throttle reaction every time.
PRECISION IGNITION MASTERY - Ultra-fine 0.6mm iridium tip delivers razor-sharp, consistent sparks for peak engine performance.

The NGK LKAR6AIX-11 Iridium IX Spark Plug 4-pack is engineered for performance enthusiasts seeking extreme ignitability and durability. Featuring a laser-welded 0.6mm iridium tip, tapered ground electrode, and triple gasket seal, it ensures stable sparks, improved throttle response, and prevents fouling and combustion gas leaks. Its high melting point iridium alloy and trivalent metal plating provide superior heat resistance, corrosion protection, and anti-seizing properties—ideal for high-performance racecar engines.

Specifications

Brand	NGK
Core Material	Iridium
Thread Size	14mm
Top Material Type	Metal
Vehicle Service Type	Racecar
Global Trade Identification Number	00087295811870
UPC	087295811870
Manufacturer	NGK
Item Weight	5.9 ounces
Product Dimensions	5.83 x 4 x 1 inches
Item model number	LKAR6AIX-11
Manufacturer Part Number	LKAR6AIX-11
Position	Center

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