Which of the following functions are performed by the engine lubricating oil circulating through a tractor diesel engine?
Options:
(A) Reducing friction and mechanical wear between moving metal surfaces
(B) Cooling engine components (especially piston underside and main bearings) by carrying away heat
(C) Forming a gas-tight seal between piston rings and cylinder wall
(D) Neutralizing acidic combustion byproducts through detergent-dispersant additives
Answer Key:
A, B, C, D
Step-by-Step Solution & Explanation
All four statements are correct primary functions of engine oil:
- Lubrication (friction reduction)
- Cooling (heat dissipation from pistons via oil jets)
- Sealing (viscous fluid film preventing blow-by)
- Cleaning and chemical protection (dispersing soot and neutralizing sulfur-derived acids with alkaline TBN reserves).