I've got a 99 Rodeo, v6 4wd

While driving I get a real strong engine oil smell in the cabin of the vehicle. It comes and goes, but it is strong. When it "goes" I don't smell it at all. Any ideas?

Thanks,
Marc

PS---I did not spill any oil in my vehicle.


99 rodeo 4x4 v6 80,000 miles
My Rodeo