The other day when I tried to pull a car out of the snow when the strap snapped (another thread on that) I noticed in the snow under the car what appeared to be some gear oil. I have not crawled under the car to check but could I have caused gear oil to vent out of the rear end? I did a lot of rocking back and forth to get the car unstuck and thought maybe this caused the oil to vent. Did not look like a lot but enough for me to notice. Does the rear end have a vent on it where this could happen? Also does the rear end use synthetic 75w140 oil? Thx