Hey guys I live in South Florida (Miami) where the climate is wet & hot most of the time. I see that the oil specs that the MFR calls for the BMW's is 5w30 to 0w40. It doesn't get cold very often down here & the driving style in the city is mostly stop & go. So is 5w30 to thin for these type of wheather & driving conditions. I mean some of the American & Jap cars I've owned called for this type of oil but I have always used 10w30 since I gets really hot in the Summer with an added bumper to bumper traffic in the HWY.