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← ScienceWhich outcome occurs when using SAE 5W-30 engine oil within an older engine?
A)Increased oil consumption develops✓
B)Improved fuel combustion efficiency
C)Reduced engine wear occurs
D)Lower exhaust emissions appear
💡 Explanation
Increased oil consumption develops because thinner oil bypasses worn piston rings via viscous drag; this fluid leak, called oil breakdown, pushes low-viscosity oil into the combustion chamber. Therefore, oil burn-off increases, rather than decreasing emissions or wear like in new engines.
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