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In page Otto fuel II:

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Otto Fuel II is a toxic substance found in EPA's National Priorities List. Ingestion of contaminated food or direct exposure at worksites can cause headaches, poor eye–hand coordination, eye irritation, congested noses, nausea, dizziness, and difficulty breathing.[1] It can be deadly if inhaled from a fuel spill/torpedo leak. An MSA Demand Mask is mandatory for cleanup/mitigation efforts.