{"product_id":"denso-4085-spark-plug","title":"Denso 4085 Spark Plug","description":"\u003ch2\u003eOverview of Denso U-Groove Conventional Spark Plug 4085\u003c\/h2\u003e\u003cp\u003eThe Denso U-Groove Conventional spark plug 4085 is engineered for reliable ignition performance in BMW M3, M5, and M6 models. Designed with a U-groove ground electrode tip, this spark plug supports efficient combustion and consistent engine operation.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eU-groove ground electrode tip design for improved spark exposure\u003c\/li\u003e\n\u003cli\u003eStandard ground configuration with a single ground electrode\u003c\/li\u003e\n\u003cli\u003eNickel ground electrode core and tip for durability\u003c\/li\u003e\n\u003cli\u003eCopper center electrode core with nickel tip for optimal conductivity\u003c\/li\u003e\n\u003cli\u003ePre-gap size of 0.9 mm for precise spark gap\u003c\/li\u003e\n\u003cli\u003eFlat seat type ensuring proper sealing\u003c\/li\u003e\n\u003cli\u003eThread diameter of 12.00 mm and reach of 19.00 mm\u003c\/li\u003e\n\u003cli\u003eHex size of 18.0 mm for standard installation tools\u003c\/li\u003e\n\u003cli\u003eManufacturer heat range of 22 suitable for specified BMW models\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eDetails on the U-Groove Conventional Product Line\u003c\/h2\u003e\u003cp\u003eThe U-Groove Conventional line by Denso focuses on spark plugs featuring a unique U-groove ground electrode tip design. This design enhances spark exposure to the air-fuel mixture, promoting efficient combustion. The conventional construction balances performance and durability, making it suitable for secondary ignition systems in performance-oriented vehicles like the BMW M3, M5, and M6.\u003c\/p\u003e\u003ch2\u003eTechnical Description and Attributes\u003c\/h2\u003e\u003cp\u003eThe Denso 4085 spark plug incorporates a nickel ground electrode core and tip, providing resistance to wear and corrosion. The copper center electrode core improves thermal conductivity, while the nickel tip maintains consistent spark delivery. With a pre-gap size of 0.9 mm, this spark plug ensures optimal ignition timing. The flat seat type guarantees a secure fit and proper sealing within the combustion chamber. Its 12.00 mm thread diameter and 19.00 mm reach are designed to match the specifications required by BMW M3, M5, and M6 engines. The heat range of 22 aligns with manufacturer recommendations for these models, supporting stable engine temperatures during operation.\u003c\/p\u003e\u003ch2\u003eCompatible Vehicles and Common Applications\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eReplacement spark plug for BMW M3 models requiring part number 4085\u003c\/li\u003e\n\u003cli\u003eSuitable for BMW M5 engines needing a U-groove conventional spark plug\u003c\/li\u003e\n\u003cli\u003eCompatible with BMW M6 vehicles for secondary ignition system maintenance\u003c\/li\u003e\n\u003cli\u003eAddresses issues such as misfires, rough idling, and poor fuel efficiency\u003c\/li\u003e\n\u003cli\u003eHelps restore consistent engine starting and smooth acceleration\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eInstallation Notes and Tips\u003c\/h2\u003e\u003cp\u003eWhen installing the Denso 4085 spark plug, ensure the engine is cool to prevent thread damage. Use a torque wrench to tighten the spark plug to the manufacturer’s specified torque setting. Verify the pre-gap size of 0.9 mm before installation, adjusting if necessary. The 18.0 mm hex size allows for standard spark plug sockets. Proper installation will help maintain engine performance and prevent combustion chamber leaks.\u003c\/p\u003e\u003ch2\u003eQuality Assurance and Warranty\u003c\/h2\u003e\u003cp\u003eDenso spark plugs, including the 4085 model, are manufactured to meet strict quality standards for durability and performance. The materials used, such as nickel and copper electrodes, are selected for their resistance to wear and thermal stress. While specific warranty details may vary, Denso products typically come with manufacturer-backed quality assurance to support reliable operation in BMW M3, M5, and M6 vehicles.\u003c\/p\u003e","brand":"Denso","offers":[{"title":"Default Title","offer_id":43446369910965,"sku":"BBNF-4085","price":10.47,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/1442\/1173\/files\/NP_4085_Fro.jpg?v=1774734428","url":"https:\/\/www.partcatalog.com\/products\/denso-4085-spark-plug","provider":"PartCatalog","version":"1.0","type":"link"}