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.
'11 Ram Quad Cab 4x4 SXT 5.7L HEMI (stock); 48,500m
'06 Pontiac G6 GT 3.5L 220hp; 64,000m
'12 Chrysler 200 Limited 3.6L 283hp; 28,000m
'99 Taurus 3.0L 2V Vulcan 145hp; 154,300m - Traded
Amsoil in all vehicles!