It is understood that hydrogen is going to be the future clean fuel, which can either be used in fuel cells or directly in engines. This will mean that there will be challenges to the lubricant developers to meet the requirements of new engines using hydrogen as fuel, where there would be no soot, no sulphur, and no carbon deposits from fuels. Lubricating base oil technology has changed during the last decade. API group III oils produced through hydro processes and GTL base oils are free from sulphur and nitrogen and have high viscosity index. Therefore the engine oil formulations would have to change considerably in the near future. The use of biodegradable lubricants mainly based on vegetable oils or genetically modified vegetable oils, would increase in the agricultural and forest sector. This book incorporates up-to-date information on these important subjects, which shall enable the readers to understand the dynamics of lubricant additive technology and tribology. The book will be useful to all those engaged in education and research in the field of lubricant additives and lubricants.