Oilers/Plant Tenders (HHC) Civil Service Practice Exam

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What type of oils are typically used in diesel engines?

Synthetic oils with additives
Highly filtered, straight mineral oils
Eco-friendly oils with low viscosity
Recycled oils

The correct answer is: Highly filtered, straight mineral oils

The use of highly filtered, straight mineral oils in diesel engines is based on their ability to provide adequate lubrication and support the efficient operation of the engine. Diesel engines generate a significant amount of heat and stress during operation, requiring oils that have appropriate viscosity and thermal stability. Straight mineral oils are derived from crude oil and are refined to remove impurities, making them suitable for high-load applications found in diesel engines. These oils typically have a good balance of properties necessary for diesel performance, including excellent wear protection, resistance to oxidation, and the ability to maintain viscosity across a range of temperatures. Although some diesel engines may use synthetic oils or oils with additives , it is straight mineral oils that have historically dominated in many applications due to their cost-effectiveness and reliable performance. Eco-friendly oils and recycled oils, while beneficial for environmental considerations, might not always meet the specific performance requirements needed for optimal diesel engine operation when compared to straight mineral oils.