🔍 Key Concepts

• Role of cylinder oil in two-stroke and four-stroke diesel engines • What happens in the cylinder when high sulfur fuel is burned (acid formation, corrosion) • How lubricants are formulated to neutralize or control acidity

💭 Think About

• Ask yourself: burning high sulfur fuel produces what harmful compounds inside the cylinder, and what type of damage can they cause? • Which property or additive in cylinder oil directly helps to neutralize those harmful acidic products rather than just cleaning or improving combustion? • Eliminate any choice that mainly affects cleanliness, flow characteristics, or ignition instead of chemical neutralization of acids.

✅ Before You Answer

• Identify which option is directly related to neutralizing acids formed from sulfur in fuel. • Make sure you know the difference between detergency/dispersancy (keeping deposits suspended) and chemical protection against corrosion. • Verify which property of lube oil is commonly expressed as TBN (Total Base Number) and what it is used for.