Spare parts, diagnostics, workshop equipment, workshop concepts

Fast Heat-up Times, Reliable Starting, Improved Cold Running Performance Bosch Duraterm High Speed Sheathed-Element Glow Plugs, Now Also for Asian Vehicles

  • Extensively expanded product range for glow plugs
  • Duraterm High Speed glow plugs for low-compression diesel engines
  • Glow plugs reach temperatures of over 1000°C in less than three seconds
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  • September 11, 2012
  • Spare parts, diagnostics, workshop equipment, workshop concepts
  • Press releases

press release

Bosch is expanding its already extensive glow-plug product range to include glow plugs for Japanese and Korean cars. Ten new plug types – for diesel-powered cars made by Hyundai, Mazda, Mitsubishi, Suzuki and Toyota – have recently been made available to workshops and retailers. These include the especially high-performance Bosch Duraterm High Speed glow plugs, which are characterized by their short heat-up times. They reach temperatures of over 1000°C in less than three seconds. With these plugs, a diesel engine can start up almost as quickly as a gasoline engine. Bosch produces all glow plugs to original-equipment standards in an international manufacturing network. To meet workshops’ needs, the new glow plugs are already listed in the Bosch Esitronic workshop software as well as in the electronic product catalog (TecDoc).

Glow plugs have to withstand extreme strain
In modern diesel engines, the glow-plug system does much more than simply getting the engine ready to start. Glow plugs’ post-glow also helps keeping engines both quiet and compliant with emissions standards while still cold. The glow plug system remains engaged even when the engine is warm during partial load operations, like urban driving, in order to increase the effectiveness of exhaust-gas treatment systems such as particulate filters.

Duraterm High Speed glow plugs are modern, low-voltage, sheathed-element glow plugs, and thus have a nominal voltage of 4.4 or 5 volts. Their very short heat-up time improves engines’ cold running performance and starting reliability, even at ambient temperatures under -25°C. Glow plugs are also subjected to extreme strain in daily use. Especially the outer glow tube has to be able to withstand rapid changes in temperature, heavy vibration as well as corrosion caused by the aggressive gases and oil ashes created during the combustion process. Bosch uses a special alloy for its glow tubes that is specifically designed to fulfill these requirements.

Glow plugs have to be checked every 80,000 – 100,000 kilometers
Glow plugs’ glow temperatures and glow times have to be calibrated precisely to the specific engine and operation condition in order to ensure compliance with emissions regulations. Bosch, a specialist in diesel-engine technology, has continually further developed glow-plug technologies working closely with car manufacturers. Duraterm High Speed glow plugs in particular fulfill all modern diesel engines’ glow system requirements. In addition the Bosch low-voltage glow-plug systems have self-diagnostic capabilities and provide error messages concerning the glow system and the glow plugs to the on-board diagnostic system (EOBD). This allows workshops to check the glow system’s functioning using an ECU diagnostic system, like one from the Bosch KTS range.

As glow plugs are wearing parts, Bosch recommends to have them re-placed every 80,000 to 100,000 kilometers or 50,000 to 60,000 miles. Usually, an engine’s glow plugs reach the end of their service lives one after another. For this reason it is more economical for customers to have their workshop replace the entire set of glow plugs at the same time. Usually the loud combustion noise the engine will make when cold indicates that the glow plugs reached the end of their service lives. Other signs showing that plugs need to be replaced include the engine running unevenly even when fully warmed up, a loss in perfor¬mance, or a decrease in fuel economy.

The Automotive Aftermarket division (AA) provides the aftermarket and repair shops worldwide with a complete range of diagnostic and repair shop equipment and a wide range of spare parts – from new and exchange parts to repair solutions – for passenger cars and commercial vehicles. Its product portfolio includes products made as Bosch original equipment, as well as aftermarket products and services developed and manufactured in-house. More than 18,000 associates in 150 countries, as well as a global logistics network, ensure that some 650,000 different spare parts reach customers quickly and on time. In its “Automotive Service Solutions” operations, AA supplies testing and repair-shop technology, diagnostic software, service training, and information services. In addition, the division is responsible for the “Bosch Service” repair-shop franchise, one of the world’s largest independent chains of repair-shops, with some 17,000 workshops. In addition, AA is responsible for more than 1,000 “AutoCrew” partners.

Additional information can be accessed at

The Bosch Group is a leading global supplier of technology and services. It employs roughly 375,000 associates worldwide (as of December 31, 2015). The company generated sales of 70.6 billion euros in 2015. Its operations are divided into four business sectors: Mobility Solutions, Industrial Technology, Consumer Goods, and Energy and Building Technology. The Bosch Group comprises Robert Bosch GmbH and its roughly 440 subsidiaries and regional companies in some 60 countries. Including sales and service partners, Bosch’s global manufacturing and sales network covers some 150 countries. The basis for the company’s future growth is its innovative strength. Bosch employs 55,800 associates in research and development at 118 locations across the globe. The Bosch Group’s strategic objective is to deliver innovations for a connected life. Bosch improves quality of life worldwide with products and services that are innovative and spark enthusiasm. In short, Bosch creates technology that is “Invented for life.”

Further information is available online at and,

PI7900 - September 11, 2012

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