Barke Oil on 2007 Mercedes-Benz E350

My service technician recommended brake oil change at around 36000 miles. Was this necessary or I got ripped off. Its 2007 E350

Asked by for the 2007 Mercedes-Benz E350
brake fluid should be replaced every 2 years no matter what miles. this is important on brake control systems like yours. it should say that in your owners or service manual.