This light came on the other day on our 2004 chevy 4500 dump, Duramaz/allison. We know it has some oil leaks around the seals and my belief is that the light suggests changing the oil. It isnt a low oil level light, that one looks different. Any ideas? Am I right thinking its hinting that we change the oil, possibly because its viscosity has changed and isnt as thick as it needs to be?