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Part number: W16EX-U13
Product Details
Denso W16EX-U13 Spark Plug
Denso W16EX-U13 Spark Plug Standard
Stock # 3029

Spark plugs are not all alike. With the world-famous DENSO U-Groove spark plug it?s easy to see, thanks to its patented U-shaped ground electrode. The U-Groove forms a channel for the spark nucleus to form at the instant of ignition, limiting quenching to generate a more potent spark. The premium features don?t stop there: DENSO?s distinctive five-rib insulator in purified alumina prevents leakage and flashover, while dual internal copper-glass seals and a copper-core center electrode with nickel-alloy tip assure reliable spark delivery. To keep your engine running smoothly, its spark plugs must fire 25 times a second or more. If just one spark plug skips a beat you?ll know it instantly, with rough running, poor acceleration, and reduced fuel economy. DENSO U-groove spark plugs combine dependable performance and superior value.


  • 100 percent pre-fired to ensure reliable operation
  • Copper core center electrode for superior thermal conductivity
  • Unique five-rib insulator reduces flashover


  • Patented U-groove ground electrode design fires leaner mixtures than conventional plugs
  • Precision machine-rolled threads reduce seizing and cross-threading in delicate aluminum heads
  • Wide range of part numbers for thousands of applications, including classic and collector cars
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Great price it would not take the discount off of shipping. not sure why still ok with the purchase
Order arrived quick and was as described.
Excellent purchase. I knew I was getting the right part due to the website set up and it came fast. The price was a plus too as it was far cheaper on autoplicity versus any other site I found.
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