What happens if oil is not changed at the recommended intervals?

What happens if oil is not changed at the recommended intervals?

• A. The oil becomes cleaner over time
• B. Contaminants accumulate and acid increase causing wear and corrosion
• C. The engine gains power
• D. The oil becomes lighter

Answer: (B)

Not changing oil at the recommended intervals lets contaminants and acids build up in the oil, which harms the engine. Oil is meant to lubricate, cool, and carry away dirt and moisture. As oil ages, it accumulates dirt, metal particles, and water, and it oxidizes to form acidic compounds. Those acids attack metal surfaces and break down the protective lubricating film, leading to increased wear, corrosion, and potential engine damage. You’ll also see the oil lose its effectiveness, so the engine isn’t as well protected as it should be. Other options don’t fit: oil doesn’t become cleaner over time, so contamination wouldn’t decrease; the idea that the engine gains power ignores the added friction and wear from degraded oil; and the description of the oil becoming lighter isn’t an accurate or reliable way to describe how oil degrades.

Not changing oil at the recommended intervals lets contaminants and acids build up in the oil, which harms the engine. Oil is meant to lubricate, cool, and carry away dirt and moisture. As oil ages, it accumulates dirt, metal particles, and water, and it oxidizes to form acidic compounds. Those acids attack metal surfaces and break down the protective lubricating film, leading to increased wear, corrosion, and potential engine damage. You’ll also see the oil lose its effectiveness, so the engine isn’t as well protected as it should be.

Other options don’t fit: oil doesn’t become cleaner over time, so contamination wouldn’t decrease; the idea that the engine gains power ignores the added friction and wear from degraded oil; and the description of the oil becoming lighter isn’t an accurate or reliable way to describe how oil degrades.