Amsoil Oil filters are specifically made by Baldwin Corp. for Amsoil. The filter is top notch construction with a really well engineered by-pass valve and excellent filter media. That said, there is nothing wrong with using the Mann filter and changing at 3-4K mile intervals.
Your choice of weight. Volvo recommends 10W-30 or 15W-40 for your climate.
Amsoil Universal ATF can easily go 3X the recommended change interval. Since Volvo doesn't specify on the ATF, I would say no problem doing 80,000-100,000 miles. If you don't feel comfortable with this, go 60,000 miles (3X your current)
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