When draining BMW X5 diesel exhaust fluid (DEF/AdBlue), which precaution is most critical?
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A
Wear acid-resistant gloves and avoid skin contact as it causes irritation
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B
Use only metal containers since DEF reacts with plastics
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C
Heat the fluid to 120°F before draining to prevent crystallization hazards
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D
Drain only outdoors to prevent nitrogen gas buildup indoors