hotter

Evening all. I wonder if someone can shed some light on a quandary... The E220 seems to be getting hotter than I would expect, particularly on a long run. There's some evidence of mayonnaise in the coolant header tank, BUT it's old and the previous owner had the HG done - there's no sign of any...

I'm running a '96 C180 Auto estate with a mere 208,000 miles on the clock. It started pinking and was noticeably sluggish so having searched the forum, I took it to the local garage for a diagnostics check and they confirmed it needed a new mass air sensor. I fitted a Bosch unit and the engine...