The amount of heat a radiator can dump is "other worldly".

They make special radiators for operating in ambient heats over say 40-50c but in normal climates the radiator will dump any amount of heat. Note when a tstat fails open the engine usually can't reach operating temp.

Also interesting to watch how amazingly quick my engine will drop from 108 to 95c when climbing hills or heavy acceleration.

I looked into lower temp tstat until I realized much of the design is meant to be hotter. It does beat the crap out of the plastic parts but I don't know if the small change in absolute temps would make much difference. Eg. If plastic parts lasted 14 years at 368k bumping that down to 363k (1.4% drop in absolute temp)

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2011 E70 • N55 (me)
2012 E70 • N63 (wife)