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← TechnologyWhich outcome occurs when an engine's fuel injectors experience varnishing from fuel oxidation?
A)Increased NOx emissions from lean combustion
B)Elevated oil viscosity from fuel dilution
C)Catalytic converter failure from sulfur poisoning
D)Piston damage from localized hotspots✓
💡 Explanation
When fuel injectors varnish, fuel flow becomes uneven because deposit buildup restricts spray patterns, causing localized lean pockets, leading to hotspots and potential piston damage. Therefore piston damage results, rather than other failure modes which depend on different chemical or mechanical processes.
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