Lexus RC 350 2019 Owner's Manual page 310

308 6-2. Maintenance
B-4: Continuous high speed driving (80% or more of maximum vehicle speed) for over 2
hours.
 Inspection
transmission fluid
NOTE:
For seat mounting bolts, front and rear suspension member retaining bolts.
*
: Perform correction or replacement as necessary.
RC350-RC300_OM_General_OM24884E
*
or replacement of automatic
I: Every 45000 km (27000 miles) or 36
months
R: Every 90000 km (54000 miles) or 72
months