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← TechnologyWhich risk increases in a diesel engine when biofuel's oxygen content exceeds acceptable limits?
A)Erosion of catalytic converter substrate
B)Increased polymerization under heat stress
C)Crankcase oil contamination accelerates wear✓
D)Elevated combustion temperature risk arises
💡 Explanation
Crankcase oil contamination increases, caused by increased blow-by due to leaner combustion driven by the increased oxygen. Elevated soot from incomplete burning contaminates the oil; therefore, accelerated wear happens rather than other purely exhaust-related concerns because particulate blow-by is changed.
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