How come it's 18,000m in the UK but 10,000m in the USA, for the same model?
And yes, it is Miles
:dunno:
Does BMW in UK use LL-04 oil, which is low-SAPS? The US gasoline has high sulfur content and the LL-01 and LL-14 are high-SAPS formulation. The high-SAPS supposedly protects the oil but still the high sulfur content in US gasoline is not kind to the oil.
Having said that, the US diesel has similar sulfur content as in Euro diesel, but the OCI for US diesel is also 10k miles.
One possibility is that since the US-spec cars till MY13 used to have 15k/2-yr free oil change for 4-yr/50k miles, with a low-mileage oil change at 1-yr mark.
By going to 10k/1-yr BMWNA saves money by eliminating low mileage oil change.