Agricultural Mechanics 2 EOPA Practice Test

Contaminated engine oil undermines lubrication. When oil picks up dirt, metal particles, fuel, or coolant, its viscosity and lubricating film break down, leading to more metal-to-metal contact, increased friction, and greater heat. That accelerates wear on bearings, piston rings, and other moving parts, and can clog passages or form sludge. Over time, these problems shorten engine life. It wouldn’t improve performance—horsepower or acceleration would likely drop—not increase—and it wouldn’t lead to cleaner emissions; lubrication problems tend to worsen emissions rather than improve them.