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Drain Plug Thread Material Question
My 71 Opel GT has the original cast aluminum oil pan. The 14X1.5 MM threads in the aluminum pan for the oil drain plug appear to be steel for durability. Is this true or are the threads aluminum material?
My 71 Opel GT has the original cast aluminum oil pan. The 14X1.5 MM threads in the aluminum pan for the oil drain plug appear to be steel for durability. Is this true or are the threads aluminum material?
