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Originally Posted by DRW1000
I have always beleived what you said to be true in that the reason transmission fluid is always clean is because it does not get contaminated due to combustion but one thing I do not understand is why does Transmission fluid wear out? Shouldn't it last forever???
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Yes, but eventually the additives start breaking down just like with any oil. It also suffers from heat spikes which scorch the fluid. The big factor (I was told) was that the carbon material in the clutches gets dissolved. While clutch material usually gets picked up by the filter, the carbon compounds actually dissolve in the oil and begin to change its properties.
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I have always heard that if one could filter engine oil effectively the fluid could last significantly longer than 5000K. In fact I have heard of some people replacing their filters and not the oil. (although I would never dream of this).
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There are actually filtration products on the market that claim you never have to change the oil. You do have to change the filters, but the oil itself doesn't break down. Its additives do get consumed and I don't know how they get around that.