Hello. I have a problem with non s mini r56 2008 with 90.000 km. I have it from 75.000km.
I change oil&filter every 7.500km.
The previous owner changed every 15.000km
Yesterday with 33 degrees Celsius outside , after a long idle at traffic, when I press the throttle, I see smoke from exhaust. On the motorway there is no smoke as I can see. Even I stop and press throttle I don’t see smoke. Only after long idle.
The coolant level is ok and without oil in . The oil are clean and the consumption is about 300+ml/1000km with motul 8100 xcess 5w-40.
When I using mobil1 new life 0w-40 at winter, the consumption was 250ml/1000km.
I want to ask which is the most likely problem?
Valve seals ?
Valve guides ?
Head gasket ?
Piston rings?
Or something else?
One mechanic said valve seals, another head gasket, another rings!
Im confused, please help me!
I can’t change all without a reason

how can I check if pcv is ok?
Thanks for the reply

how can I judge if it has a lot of oil?
how should it be normal?

Ok, let’s say pvc have problem ... why I see smoke only after long idle, and only if the engine is really hot?

Thanks for your advice.
I wonder if was stuck open .... the idle was stay smooth?

How can you find out if the problem it is at valve seals or at valve guides ?

so you said that is only valve seals? Not the guides?
thanks for the reply
(my English is not good sorry)

I think it’s a different part the seals from guides.
so In your opinion which is the problem ?