On our 3.5L Olds Aurora I replaced the ATF (Dex3 spec) back in the spring of this year and a couple thousand miles ago (probably 2-3k) with Napa Dex/Merc fluid. Did the pan/filter method which supposedly on these trans does get the vast majority of fluid- spec is 7.4qts capacity and it took 7.0qts to refill.
Checked the dipstick yesterday and noted the fluid looked very dark, which I know does not really mean a thing with ATF but considering the low miles on the new fluid combined with the high miles on the old fluid I was wondering if its worth spending the $25+ on a UOA, if its better to just do another fluid exchange or maybe not worry about it at all. Trans seems to shift pretty good, certainly hasn't changed at all.
Checked the dipstick yesterday and noted the fluid looked very dark, which I know does not really mean a thing with ATF but considering the low miles on the new fluid combined with the high miles on the old fluid I was wondering if its worth spending the $25+ on a UOA, if its better to just do another fluid exchange or maybe not worry about it at all. Trans seems to shift pretty good, certainly hasn't changed at all.