Did you say that you think that it's been running a bit hotter than normal? Have them check all stored codes, as well as seepage, or cracking around the waterpump and the termostat module. They know where the waterpump is prone to cracking - have them make a visual inspection.
Also have them check for oil leaks around the oil filter housing. There is a gasket there that is prone to leaking on the 35i. They know what to look for, as it's a common problem across every BMW with that engine.
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