Additive packages for many fluids have gotten quite good. I am of the opinion that it can't hurt to change over time, so 5 years is a nice round number i use (often 50-60K as well) for ATF, PS fluid etc...I use OEM fluids often for this. Nissan recommends J-Tronic for example in many of their cars and I recently had my shop do it for a 2006 G35 we own. Cost was < $100.
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