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In 1990 the Ministry of Research and Technology in the FRG proposed a comprehensive concept to sponsor biotechnical and energetical use of agricultural materials. Within this concept various modern Diesel engines have been investigated with respect to performance, fuel consumption, exhaust emissions and durability characteristics using neat (100%) rapeseed oil as fuel. Energy consumption and engine performance are similar to operation with Diesel fuel, exhaust emissions are higher with rapeseed oil. Diesel engines with divided combustion chambers and big cylinder units are suited for continuous operation with rapeseed oil.

Reduction of exhaust emissions, increase of power output and fuel economy, and engine brake systems with higher performance, are the most important factors within the development of Heavy Duty Diesel engines. All of these issues result in an increase in loading for the entire valve train. To fulfill the increasing requirements, modern Heavy Duty Diesel engines are using valve train configurations with roller followers, designed as roller tappets or roller levers. While these roller followers are well-known engine components, there is a great demand for the enhancement of functional properties and simultaneous cost reduction. Main areas for the design work are the base design of body or lever with roller chamber, push rod area and lever geometry and especially the roller bearing together with the assembling technology.