I agree with your thoughts. Oil changes have diminishing benefits over time as the transmission degrades. However, I think the fresh ATF does help clean the valving after a couple hundred miles. Oil drain and fill is cheap and easy compared to transmission replacement.dikidera wrote: ↑09 Sep 2025, 01:43 On my previous Aw55 transmission, changing the oil at one point yielded no benefits. And when I say changing the oil, I do mean 40 actual quarts over a span of a year. At some point I replaced it.
My "new" transmission is somewhat better and I think it's the first where I've seen a benefit to changing the oil, but we will see, I've usually observed that any benefits are usually temporary. And the broken torque mounts have definitely exacerbated any bad shifting.
I did a 3.4 quart change with genuine Volvo Jws3309 oil. There was some slippage when going very very light throttle, barely touching it, but after going 300km, it does seem to have improved.
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