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on the gems motors, its just a rtv seal, when they went to bosch, they used a rubber gasket. both leaked pretty regularly, as yours will too if you used silicone to seal it
as you might have noticed, the pan isnt made to the tightest tolerances, its cheaper and easier to just use a sealant, plus, if done correctly, will generaly hold up for a good long time. and cmon, its a step up from cork.