OVERSTOCKDIRECT Iridium Spark Plugs SP550X CYFS-12Y-PCTX 4-Pack — OEM, Long-Life Performance

OVERSTOCKDIRECT SP550X CYFS-12Y-PCTX is a four-pack of genuine OEM iridium spark plugs designed to replace the earlier SP550 series and restore consistent ignition performance.

These SP550X iridium plugs are the OEM-updated replacement for the SP550 CYFS12YPCT and are sold in a set of four for convenient vehicle servicing. Built to the original manufacturer's specifications, they use a fine iridium tip for durable electrode life and steady spark delivery. Before ordering, confirm compatibility with your engine model and cylinder count to ensure the correct fit and performance.

How does the SP550X improve ignition reliability?

The iridium center electrode provides a precise spark gap and resists wear better than standard materials, helping maintain consistent ignitions over many miles. Improved electrode durability reduces misfires and delivers steadier combustion under normal driving conditions.

• Fine iridium tip for stable spark and long service life
• OEM manufacturing tolerances for exact fit and sealing
• Designed to reduce electrode erosion versus conventional plugs

Will these plugs fit my vehicle and how many come in the pack?

This listing contains four genuine OEM SP550X CYFS-12Y-PCTX spark plugs—commonly required for 4-cylinder engines—but compatibility varies by make, model and engine. Always check your vehicle’s OEM part number or use a compatibility lookup to confirm fit before purchase.

• Includes 4 spark plugs in one kit for typical 4-cylinder engines
• Replaces SP550 CYFS12YPCT with the updated SP550X version
• Verify application against engine and drivetrain specifications

How should I install and torque these iridium plugs?

Install by hand until seated, then tighten to the vehicle manufacturer's recommended torque to avoid damage or poor sealing. Use a quality torque wrench and a compatible spark-plug socket; if unsure, have a professional technician do the job.

• Hand-start each plug to avoid cross-threading
• Torque to manufacturer spec to ensure proper seal and heat transfer
• Use anti-seize only if manufacturer advises; check gap if required

What maintenance or lifespan should I expect from these iridium plugs?

Iridium electrodes typically last considerably longer than copper or standard platinum plugs under normal driving conditions, often allowing extended service intervals. Actual lifespan depends on driving habits, engine tune, and conditions; inspect periodically and follow the vehicle maker’s replacement schedule.

• Longer service interval compared with conventional spark plugs
• Better resistance to fouling and electrode wear
• Performance depends on engine condition and driving environment

Who is this for: This four-pack is intended for drivers and mechanics seeking genuine OEM replacement parts—especially owners of compatible vehicles that originally used the SP550 series—who want an updated iridium option for longer life and reliable ignition. It’s suitable for do-it-yourself installers who verify fitment and for service shops that require authentic OEM components to match factory specifications.

Features

• Insist on Genuine OEM Parts for the Best Performance of your Vehicle
• Offering the Quality, Reliability and Durability You'd Expect from OEM Parts
• Research Applications Prior to Purchase To Make Sure This OEM Part Fits Your Vehicle, Including Engine, Drivetrain and Quantity Needed.
• OverstockDirect Offers Unbeatable Service
• This Listing is for 4 Spark Plugs