I've had the 6000 mile service on my 2016 RT but noticed in the manual (p. 188 - 189) that the final drive fluid should be changed after one year and then every 12,000 miles. Apparently it is not part of the 6000 service since I hit 6000 mile well before a year had elapsed. I don't see any recommendation for changing the coolant or clutch fluid and can't seem to find any recommendations on line. Any suggestions on what is the appropriate interval?