To do a lot more research about oil, take a look at http://www.bobistheoilguy.com. ï· BMW's recommended interval of 12,000-15,000 miles is too long. Used oil analysis has shown the BMW oil is generally depleted at 10,000 miles. Running it longer results in excess wear.Spark Plugs I recommend changing your spark plugs every 60,000 to 80,000 with OEM Bosch or NGK spark plugs.o do a lot more research about oil, take a look at http://www.bobistheoilguy.com. ï· BMW's recommended interval of 12,000-15,000 miles is too long. Used oil analysis has shown the BMW oil is generally depleted at 10,000 miles. Running it longer results in excess wear.