Denso K20HR-U11 (3381) Spark Plugs — 6-Pack U-Groove Standard Replacement, OEM Fit

These are genuine Denso K20HR-U11 (3381) U-groove standard spark plugs sold as a 6-piece set for direct replacement in compatible vehicles.

When you need a straightforward, factory-quality spark plug swap, this Denso 6-pack offers the same design and specifications as original equipment. Each plug features Denso’s U-groove electrode profile and is packaged with the original labeling and hardware to simplify installation and part verification. This product is intended as a direct replacement part — confirm fitment with your vehicle’s application guide or the Amazon Confirmed Fit tool before ordering.

Will these spark plugs fit my vehicle?

Compatibility depends on your engine’s plug type and the manufacturer’s recommended specification. The K20HR-U11 (Denso part number 3381) matches certain OEM applications; always cross-check against your vehicle’s service manual or an official parts lookup.

• Part number: Denso 3381 / K20HR-U11
• Sold as a pack of six identical plugs
• Intended for engines specified to use Denso U-groove standard plugs
• Use vehicle fitment tools to confirm compatibility before purchase

How do these Denso U-groove plugs affect routine maintenance?

These standard plugs are designed for routine replacement intervals aligned with your vehicle’s maintenance schedule. Swapping in matching plugs helps maintain consistent ignition characteristics and makes inspection and future servicing simpler because they use familiar geometry and torque specifications.

• Replace according to your manufacturer’s mileage interval
• Use correct torque and gap settings when installing
• Pack includes original hardware and labeling for verification
• Standard plug design simplifies troubleshooting by mechanics

What are the physical and packaging details of this product?

This listing contains six Denso K20HR-U11 spark plugs, each manufactured to Denso’s standard specification and supplied in original packaging. The set includes any factory-installed hardware and labels, making it straightforward to confirm authenticity and part numbers on arrival.

• Quantity: 6 spark plugs per package
• Electrode style: U-groove standard electrode
• Packaging: original Denso packaging with labeling
• Sold as genuine OEM-quality replacement parts

Are these plugs easy to install for a DIYer?

Yes — for anyone familiar with spark plug replacement, these Denso plugs install like other standard spark plugs. Use the correct socket, follow the recommended gap and torque, and replace one cylinder at a time to avoid mix-ups. If you’re uncertain, a professional technician can install them quickly.

• Installation requires basic hand tools and a torque wrench
• Follow your vehicle’s gap and torque specifications
• Replace plugs one at a time to maintain cylinder order
• Consult a mechanic if you lack experience

Who this is for: This 6-pack of Denso K20HR-U11 (3381) U-groove standard spark plugs is aimed at vehicle owners, repair shops, and DIY mechanics seeking authentic OEM-style replacement plugs in bulk. It’s a practical choice when your engine calls for Denso’s U-groove standard design and you want to keep a matched set on hand for multi-cylinder engines or routine fleet maintenance. Always verify fitment for your specific make and model before installation.