This has been discussed before and it seems that everyone agrees that while towing the road grime (oil, debris, etc accumulates on the undercarriage. After running the engine or driving for 10 minutes or so the smell dissipates. I have found this to be true as I have now towed the Jeep about 5000 miles on about 15 trips.
Ronnie
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"Piddln"
2008 Jeep Sahara '4Dr"
Ronnie Bledsoe
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