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My user manual states:
Transfer Case/Transmission - Inspect each transfer case/transmission component for signs of leakage. If you discover any leakage, have it repaired immediately by a qualified technician.
Note: The transfer case/transmission and transmission fluid are a completely sealed unit. Therefore, periodic checks and replacement of the transmission fluid are not required, and there is no dipstick on the transmission. Any repairs that require adding or replacing fluid should be performed by a qualified technician following procedures in Lexus service and repair publications.
Now granted maybe my Lexus is bulletproof, the user manual instructs service intervals up to "180 months or 150,000 miles" and beyond "Inspect transmission for signs of leakage," nowhere does it say "replace transmission oil" except when towing every 60k miles. So maybe, if you're driving it hard... then this is the equivalent of towing... that I can see.
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