That's normal. It's how a mag plug works.
Quote:
Originally Posted by JEDI
I used Royal Purple 0w-20 for engine.
Royal Purple 75w-90 for both Trans and Diff.
Here's a pic of my Differential Drain Plug after 9900 miles.
I bought the car with 9560. I'm hearing this is common in our cars, but not fact. Sorry for the huge pic.

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