Denso 3135 Spark Plug

Denso 3135 U-Groove Spark Plug for Volkswagen and Nissan

The Denso 3135 is a conventional spark plug built for steady ignition performance in a range of Volkswagen and Nissan applications. Its U-groove ground electrode design is engineered to improve ignitability, helping the engine light the air-fuel mixture more consistently for smoother operation and better efficiency.

As part of Denso’s U-Groove Conventional line, this plug combines a copper center electrode core with nickel tip materials and a nickel ground electrode core for a proven OE-style construction. The 5000-ohm resistor helps control electrical noise, while the 1.1 mm pre-gap supports direct replacement service on listed applications.

Key Features

• Denso part number 3135
• U-Groove ground electrode tip design for improved ignitability
• Conventional spark plug construction for OE-style service replacement
• 5000-ohm resistor for reduced electrical interference
• Copper center electrode core material
• Nickel center and ground electrode tip materials
• Flat seat design
• 14.00 mm thread diameter, 22.00 mm reach, 16.0 mm hex size
• Manufacturer heat range 16

Product Details

The Denso U-Groove Conventional line focuses on dependable secondary ignition performance with a design that promotes stronger spark exposure at the electrode gap. For Volkswagen Golf, Jetta, Beetle, and EuroVan models, as well as Nissan 240SX, D21, and Pickup applications, the Denso 3135 provides a direct-fit spark plug option built around the listed OE-style dimensions and heat range. This part cross-references DENSO Auto Parts K16GPR-U11 for the same application.

What It Helps Address

• Hard starting caused by worn or inefficient spark plugs
• Rough idle from inconsistent ignition at the plug gap
• Misfire conditions related to aged secondary ignition components
• Reduced fuel efficiency from weak spark delivery
• Electrical noise concerns in resistor-equipped ignition systems

Installation Notes and Tips

Verify thread diameter, reach, seat type, and heat range against the vehicle’s service specifications before installation. The listed pre-gap is 1.1 mm, so confirm gap condition during service and inspect ignition wires, coils, and boots at the same time. For fitment reference, this part fits 2010-2014 Volkswagen Golf, 2001-2010 Volkswagen Jetta, 2001-2008 Volkswagen Beetle, 2001-2003 Volkswagen EuroVan, 1995-1997 Nissan Pickup, 1990-1994 Nissan D21, and 1989-1990 Nissan 240SX.

Quality Assurance

Denso manufactures this spark plug to OE-style dimensional and material standards for listed Volkswagen and Nissan applications. The combination of nickel and copper electrode materials, resistor construction, and U-groove tip design reflects a service part built for consistent ignition performance in secondary ignition systems.