🔍 Key Concepts

• Relationship between lubricating oil temperature and viscosity • Manufacturer’s recommended maximum outlet temperature for lube oil systems • Effect of higher temperatures on oil breakdown and bearing safety

💭 Think About

• Which temperature range keeps the oil thin enough to flow and separate impurities, but not so hot that it risks thermal breakdown? • Think about standard lube oil operating temperatures for main engines and turbines—what is generally considered the upper safe continuous limit? • If you go too close to the temperature where oil starts to oxidize rapidly, would that be considered a safe upper limit for routine purifier discharge?

✅ Before You Answer

• Compare each option to typical continuous lube oil operating temperatures (not emergency or short-term limits). • Ask: At which of these temperatures does oil oxidation and breakdown start to become a serious concern in machinery spaces? • Verify what is generally accepted as the manufacturer-recommended maximum discharge temperature for lube oil from purifiers in marine practice.