Engine Oil Residue Under Rear Engine Seal???

[Pittdawg]

Had my Voy up on a lift getting the rear pumpkin drained and lubed back up (been about 600 miles since installing my new rear gears) and my mechanic noticed this underneath the engine. Does anyone no what that residue is and should I be worried?

 

[McGMT]

Just a little bit of engine oil... Probably seeping past your rear main, I wouldn't be concerned unless its starts dripping...