🔍 Key Concepts

• Oil bath air cleaner function – how oil traps dust and contaminants before they reach the engine • Effect of dusty/dirty atmosphere on filter loading and maintenance intervals • What dirty or thickened oil inside an air cleaner indicates about how hard the filter is working

💭 Think About

• Think about what happens to the oil in an air cleaner when the engine is operating in very dusty conditions. Would the oil get dirty faster or slower? • If you see that the oil in the air cleaner is unusually dirty or has thickened, does that suggest it is doing more or less filtering work? How should that affect how often you change it? • Looking at each answer, which options are suggesting the same direction of change (more vs. less frequent) for both dusty conditions and dirty/thickened oil, and which suggest opposite changes?

✅ Before You Answer

• Make sure you understand that dust and contaminants are captured in the oil, so more dust generally means the oil becomes contaminated faster. • Verify whether dirty or thickened oil is a sign that the oil can be kept longer or that it may be restricting airflow and needs attention sooner. • Check that the option you choose applies more frequent changes in situations where contamination would increase, and avoids suggesting less frequent maintenance when conditions are harsher.