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The Ultimate Heavy Equipment Maintenance & Diagnostics Quiz
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What is the primary purpose of Diesel Exhaust Fluid (DEF) in modern Tier 4 final diesel engines?
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Hint
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⚖️
50-50
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Audience
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A
To lubricate the fuel injectors
B
To reduce nitrogen oxide (NOx) emissions
C
To clean the particulate filter
D
To boost engine horsepower
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