Where can I find the cheapest oil pan bolt set
Not overkill exactly the way to do it. The "longer bolt" idea is only to turn it in by hand and detemine which of the holes are the shallow holes. Get the correct length they should be spec at real OEM.
I have no problem adding sealant but depending how clean the seat I would be perfectly ok using just the gasket.
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2011 E70 • N55 (me)
2012 E70 • N63 (wife)
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