A new oil pump seal shouldn't leak for years if installed correctly. Could you have got the torque spec number mixed up - they are listed in 3 different units in the BGB. The M6 bolts in for the oil pump don't have a very high value, but it should be a lot more than "hand tight".
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If the oil pump housing (on left in pic above) is still installed on the engine, then the "spaghetti" seal would be more prone to come out of it's groove when installing the pump body. I've actually only installed the seal when the pump housing was also off the engine, and hence horizontal.
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