Most dealerships and independent shops will attempt to sell these "Fluid Flushes" as it is a huge profit margin for them and they usually receive a kick back from the Aftermarket Companies Marketing these flushes.
This Discussion is a publication from CHRYSLER pertaining to Fluid Flushes and is shared by all of the major auto manufacturers.
DISCUSSION:
Chrysler Group vehicle fluid systems do NOT require regular flushing. These systems include: engine oil, transmission oil, axle lube, brake fluid, power steering fluid, and refrigerant. The only exception to this requirement are published in the vehicle maintenance schedules,
Exceptions to this recommendation include only those instances where a failure has occurred and/or the system has become compromised, contaminated or overheated beyond the normal operating range.
Chrysler Group does NOT recommend aftermarket chemicals to flush the engine, transmission, brake or steering systems. Chemicals contained in these products can damage the system elastomeric components, and contaminate the component fluid, leading to loss of system/component durability and service life. When necessary, only the original approved system fluid should be used to flush these components