I would even go so far to suggest you try to position these horizontal to provide a place for the oil to pool and more easily be seen. I've had some trouble finding the right connectors to connect the two different sizes.

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Charles
1983 300D, bought new, 215k+ miles, donated to Purple Hearts veterans charity but I have parts for sale: http://www.peachparts.com/shopforum/showthread.php?t=296386