stripped aluminum oil pan thread
#12
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they have threaded fittings on the wall...you can screw it into the fitting to determine the specs of the bolt/hole. I'm not sure if they will have one that large, but they mostly likely have a tool that can measure the bolt to determine the size of the tap you'll need.
#20
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The only way the bolt is going to spin is if all the threads are chewed. If that's the case, there isn't enough torque on the bolt to seal the oil in the pan. Another washer becomes decorative more than anything else.