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Those are not cracks, that's crazing. Crazing is when polycarbonate and other amorphous plastics become saturated with a solvent and begin to lose their plasticity. It creates lines in the plastic with microscopic fibrils of material bridging the lines. The crazing will continue to worsen until the light is ruined.
Car manufacturers know about this and should replace the headlight under warranty, although it might be wise to not mention you spilling engine treatment on the light.
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The oldest of the old-school!
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