Quote:
Originally Posted by lupindub
Not to be pedantic but the orientation does matter... Flat side should be facing toward the plug and the rounded part towards the oil pan. I even asked the dealership about this the other day.
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Strangely enough, I had the same problem when I switched to the Greddy drain plug very recently. With the flat side facing towards the oil pan, it leaked a little. With the flat side facing towards the plug itself, no leak. I suspect that the rounded side not only squashes but inserts slightly into the drain hole and is therefore deformed around the edges of the hole, providing a little extra bit of seal. Just a guess, I do know that the orientation seems to matter.