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After the oil has set a while a propane torch will make it pentrate more. Let it cool down and douse it again. wait and then use an air impact wrench set on low pressure work the fastener loose. You should use low setting first to get some movement to get the oil to seep in more. It takes time but you do not want to break the bolts. Impact is better than brute force. Torque wrench is better used to make sure you put things back together with proper pressures.
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