>> Not X-drive and less than 40k so 36k service should have been done.
>>
>> All the info I've read so far boils down to speculation about oil/coolant leaks and
>> Vanos solenoids playing up.
Seems to me that most of that (oil and VANOS anyway) is fears carried over from the previous lump, the N55. The coolant "loss" is misunderstood, overhyped or rather unexplained. from 0- 18k miles it will loose about .3 litres, no sign of where its gone. from 18-36k the loss drops to about .2l, from 36k onwards its stable - no loss. The intercooler coolant level is stable from mile 1
Its recognised to be BMW's most reliable lump to date, so good that Toyota happily use it.
After your warranty is over, dropping oil changes to 12k (ignoring the BMW service indicator) is deemed to be good practise, which is is what I do.
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BMW - BMW B58 new