Best Spark Plugs for Ford F-250 and F-350 Super Duty

The Ford Super Duty is built for serious work — heavy towing, hauling, and demanding commercial use. Its gasoline engines need quality spark plugs that hold up under high-load conditions day after day.

6.2L Boss V8

The 6.2L gasoline V8 is found in base and XL trim Super Dutys. Motorcraft SP-520 plugs are the OEM specification. This engine is designed for longevity under load — quality iridium plugs support that goal with 60,000-mile service intervals.

7.3L Godzilla V8 (2020+)

Ford's new 7.3L pushrod V8 is a massive, torquey engine built for work. Motorcraft SP-661 plugs are the OEM spec for the 7.3L. This engine uses a traditional port-injection design that is slightly more tolerant of plug wear than direct injection — but OEM iridium is still the right choice for longevity.

6.7L Power Stroke Diesel

The most popular Super Duty engine uses glow plugs, not spark plugs. Service interval varies — inspect every 100,000 miles or consult your owner's manual for the specific schedule.

Heavy Towing and Plug Life

Super Duty trucks used for sustained towing should have plugs inspected at 40,000 miles even with a 60,000-mile OEM spec. Sustained high-load operation — particularly at elevation or in extreme heat — shortens plug life measurably.

Shop Super Duty spark plugs at Texan Supply with free shipping.