🔍 Key Concepts

• Sulfur in fuel and how it behaves during combustion • Effects of acid formation in diesel engines, especially at low loads and low temperatures • Difference between mechanical issues (like clogging) and chemical/ corrosion issues inside the engine

💭 Think About

• When sulfur in fuel burns, what chemical compounds are formed, and how might they interact with moisture in the engine or exhaust? • Under what operating conditions (high load vs. low load, hot vs. cooler metal surfaces) are corrosive effects more likely inside a cylinder and exhaust system? • Which options describe long‑term chemical damage versus short‑term performance effects like starting or efficiency?

✅ Before You Answer

• Think about whether sulfur is more likely to create solids that clog or acids that corrode • Consider how engine load and temperature affect whether harmful compounds will condense on metal surfaces • Eliminate any answer choices that confuse cold‑starting characteristics or thermal efficiency with the chemical effects of sulfur combustion