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Your brake fluid and coolant should not be older than this calendar year.
Otherwise, don't worry. My water temp and oil temp were no problem at all in 100F temperatures for 25 minute runs. I have a secondary oil cooler, but three other 135is that don't have extra oil coolers also had no problems in the same conditions.
If you look at the thread at e90post, it seems to be cars with AT that are having cooling problems. If you want to make extra sure, change your coolant to 100% water plus Water Wetter additive.
I don't know anything about oil, but I just use the stock BMW oil and as I said I don't have any problems.
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