Re: 2009 Escape 4x4 found oil on the rear axle
That's a vent tube to release pressure as you drive, heat builds up in the differential and instead of having the seal burst causing a differential failure, the vent allows excess air and heat to escape through the vent. Some seepage is normal but monitor it as it should stop after a while. Another possibility is the differential was slightly overfilled at the factory.
Generally, the vent is attached on the top of a tube that's a good 4-12" above the differential, so if you drive through puddles etc, water won't seep into the vent and into the diff contaminating the oil.
'00 Durango R/T 360ci 290hp (modded); 138,500m
'06 Pontiac G6 GT 3.5L 220hp; 44,000m
'12 Chrysler 200 Limited 3.6L 283hp; 13,000m
'99 Taurus 3.0L 2V Vulcan 145hp; 154,300m - Traded
Amsoil in all vehicles!