Same here...All I said was DAMN!!!. Just like you, nasty black oil all over the driveway. I now have mine done at my local tire shop. Shoot, that oil even splashes out of the deep extenable container they use. Geno's garage sells a reducer plug that limits the flow but I'm just too damn lazy now

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7.5 3500QC 6.7CTD 68RFE Build date June 2007
Superchips tuner 3808, Boost/EGT Laser Gauge, Airaid cold intake