I use Liqui-Molly 5w-40 along with a Mann oil filter. I did add Liqui-Molly CeraTech at 70k miles. I am at 72k miles right now. I have not noticed any difference. Idk If I'll use Ceratech again. But, I change my oil every 5k/6 months and buy an oil change kit off fcp (lifetime warranty on everything).
Oil change kit:
https://www.fcpeuro.com/products/bmw...427566327kt-lm