I trackled the oil filter housing gasket on my 08 3.0 X5 this weekend. For me it was a PITA, that plastic outlet piping broke on the rad hose, had to change with an aluminum one from Amazon. Glad that's over. On the oil filter housing or " oil cooler" the bottom bolt wasn't tight enough, so It did spray a bit of oil. I retightened it. That being said is there any way since it wasn't snug 100% that coolant and oil could have mixed in those passages? Or am I just being paranoid and shouldn't bother doing an oil change. My logic says if it already leaked oil before and no issues arose, I should be fine.? despite my careless job at not fully torquing that third bolt on the oil cooler.