|
The timesert repair takes some care to make sure that it is square/flush to the pan. Other methods include using a an oversized plug.
I agree that the dealership did not hand tighten and torque the plug as they would have felt the threads not catch. (A very bad feeling!) They wouldn't have added oil if the proper procedure was used.
I'll put my two cents in on another possible cause. Aluminum is also know for fretting. This is where small movements cause breaks in the oxide film on the aluminum. This leads to micro welds between the plug and pan. If one looks inside the pan, the main drain plug doesn't have a full 'ring' all the way up. There are cut outs to allow the oil to drain out. This could lead to some different thermal stresses as the temperatures vary.
|