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Originally Posted by PhilD
I'm not 100% that ATF blotter test is totally accurate, but it does seem to give a good indication. I always work on the basis, when in doubt change it. If ATF is very dark, smelly, or opaque, I change it.
The original dino ATF in my t-case went bad very quickly, and I change it every 10k now, worthy checking if you've never looked at it. same goes for the diffs, which don't ever require a fluid change according to the manual, just a top up. The fluid in them goes bad as well.
I've started using Royal Purple in the diffs and t-case and been very happy with it so far.
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Completely accurate. It's a test that's used when evaluating oils and fluids for oxidation and breakdown. The blotter test lets you know that the fluid still flows because it spreads through the paper. If it is oxidized and gunked up, it will sit and not spread very much. They test how long fluids can sit at certain temperatures (mainly engine oil, tranny fluid, gear oil) to make sure it can not break down under extended use at XXX temperature.