sxs191

I replaced the thermostat in my brothers 2010 last night. I didn't realize till this morning that the "Genuin Mercedes Thermostat" I bought from Pelican Parts is 100c. I know the one the from the factory was an 80c. Should I be concerned as that is a big jump? Also, the radiator fluid i bought; Zerex g-05 is yellow and the fluid in the vehicle was blue. Thanks, Scott

SAVZ

I think that's fine as long as it's consistent. What does the guage read? I did mine last year, it was a wahler thermostat. Guage now shows a constant 90c, while the torque app shows a consistent 98c. Before the guage used to read between 80 and 85 and struggling to hit 80 in very cold weather. I had the yellow stuff originally, mine is also a 2010, but the dealer sold me the blue stuff, which was still 325.0. don't think the colour matters as long as it is the 325.0 spec coolant

Mmr1

KC61

Everything I have read states the Zerex G-05 is 100% compatible with the Mercedes coolant. I do believe you need to dilute either one, they are not premixed. I think the biggest issue with the coolants is the silicates. You need a silicate free coolant for aluminum otherwise it can detoriate the aluminum. That's what i remember anyway from my wifes SLK 320