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Well, here's a slighyly different view:
Coolant: I use Volvo, because it says to and I have learned to follow directions in the absence of other good evidence. Come on, so it's $14 bucks. You change it every 60K, 30k if you're a worrier and be done with it.
Transmission fluid. Change to synthetic after a good flush. My Volvo mechanic told me to bring in 10-12 quarts. I'd keep it in there for 100K, unless you trailer a lot, or you are a worrier. It's still about half as long as Volvo recommends to change it (which is never)
Use sythetic oil, Mobil 1 or Amsoil. I use 0W40 Mobil 1, because that's what my Volvo mechanic uses in his 98 S90, and he knows about these cars about a 100 more times than I. I change it twice a year or about 6K. Mine also burns oil, so I'm refreshing it from time to time.
My understanding is that the synthetic AFT in the power steering is perfectly accetable. I think mine may actually have it in, since the hose was replaced.
I don't consider this stuff exact science, so there is a lot of personal preference mixed into fallible measurements.
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John Shatzer, '97 V90 @ 115K
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