🔍 Key Concepts
• Effect of fuel dilution on lubricating oil properties (viscosity, film strength, flash point)
• What centrifuging, filtering, and straining actually remove from oil (type of contaminants)
• Manufacturer/engineering practice when oil is chemically or physically altered, not just dirty
💭 Think About
• Ask yourself: does fuel dilution mean there are solid particles in the oil, or has the oil itself been thinned/contaminated by another liquid?
• Which treatment methods (centrifuging, filtering, straining) are designed mainly for removing water or solids, and which action is taken when the oil’s basic lubricating properties are no longer reliable?
• Consider engine safety: if oil is excessively thinned by fuel, what is the safest maintenance action to protect bearings and moving parts?
✅ Before You Answer
• Identify whether fuel in lube oil is a solid, water, or another liquid hydrocarbon and how that affects oil quality
• Match each option with the type of contamination it best addresses: solids vs water vs chemical/physical breakdown of the oil
• Think about standard engineering practice: when oil is excessively contaminated so that its properties are changed, what is the recommended corrective action?