Mine burned a bit. Plus leaked a lot too. Fixed all the oil leaks. Switched from Castrol 5-30WT to Castrol 5-40WT. Mostly due to heavy traffic and hot summers. No more exhaust smoke. The M54 runs great on it. With so many miles on yours, I would stick to the thicker oil.

__________________
'06 X5 3.0i - bought @143,123 miles (12/26/20)