My niece just got a 2023 Countryman. The manual recommended oil is LL-14 FE+ or LL-17FE+. From what I can find, these will be 0W-20. Would you advise her to go with something like a 0W-30 or even higher viscosity? My gut is 0W-20 is all about fuel economy. Some say these engines (B48) really should run something with a higher vis. Still under wtty so I imagine she will want to stick with the recommended oil but I thought I'd offer my 2 cents worth.