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Well, I noticed the Firestone oil change reminder sticker in the ML and somehow doubted they used the filter and oil MB suggests. I went out to Northern Tool and bought a vacuum oil extractor.
The filter in there was a Mann.....and looked horrible, so I'm figuring that Firestone didn't change the filter..
Got the old oil and filter out, a fresh Mann filter and almost 9 quarts of Mobil1 0w-40. She definitely is a bit quieter now.
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