Originally Posted by SnowDrifter
I'd change it. Oil goes bad over time. Ever see the pan pulled from a vehicle that's been sitting for a number of years? It's all sludgy. We're not talking about a few month here, we're talking over a decade.
Pull a sample and send it in if you're concerned. But at the end of the day, it's your vehicle. You will be the one to reap the outcomes of maintenance decisions, not myself or anyone else here giving advice
Not to argue with your point about engine oil, but this is a tranny. The chemistry that happens there is at much lower temperatures, and the contamination is due to forces happening inside the mechanism, not from smoke, gasoline etc. Oil can go "bad" over time vs miles in a taxi service situation, or some other where an engine will idle non stop...again, that only applies to an engine.