My son recently purchased a 1985 300D. We've been going over the car performing maintenance and repairs. A previous owner installed a spring loaded oil drain but the local mechanic we purchased it from had no idea how to correctly operate it. I laid on the floor and held the thing open with a nail for almost twenty minutes last change which was about as much fun as it sounds. Luckily that did not effect the seal (at least not yet). It's time for another change and I'm tempted to remove the unit, although am afraid I might mess up the oil pan in the process. Does this look familiar to anyone? I've got another picture with the cap removed but cannot figure out how to include the second photo. Thanks for the help.

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