I have had a toyota Avalon(1997) and Infiniti Q45 (2002) for the last 8 years.
So i can only speak to those to makes.
Both of them were perfecvtly fine coasting in neutral. the rpm in the Q45 drops to around 600 which is the dead idle.
the avalon had 215k when I got rid of it (only because the Q45 came along cheap)
the Q45 has 245k on it. Neither tranny has any problems
as a note : I drove a 200x taurus for a customer for a week. It did not like being in neutral while moving. rpms stayed in the 2000 range
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