after I had hoses and thermostat replaced. I was about 500 miles from home a few weeks ago when I developed a coolant leak. Kept coolant topped up on the ride home, and the gauge was running at about the normal 82 deg C all the way home. Brought it in to local mechanic to have hoses replaced, and thermostat was replaced at same time. When I got it back, it ran at a steady 90 deg C. Returned it to the garage, and they replaced the thermostat with another 82 deg thermostat. Same result. Mechanic confirmed that the thermostat was opening at 82 deg or so. My question: Is this something I need to revisit, or could it be a dash gauge problem? My ride has 'only' 286,600 miles on it, and I want to make it last to 500K if I can...

Thanks in advance!

__________________
Mine: 1987 MB 420 SEL - 66K (Dec 2019)
Mine:1991 MB 350SDL - 244K (Aug 2011)- Totalled 9/14/2016
Mine:1981 MB 300SD - 326K mi (July 1997)-sold
Wife's: 2008 MB C300 Sport - 110Kmi (April 2009)