I don't know whether your C43 is the same as W210 E classes, but Mercedes designed a buffer in the temp gauge of W210's so that the gauge stays at 95 degrees when the temp goes between 95 and 115 derees celsius.
Your temp might be fluctuating, but you wouldn't be aware of it by looking at your gauge.
2001 E430, Bourdeaux Red, Oyster interior.
1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".