Use a good synthetic oil 5W30 or 5W40 or 0W40. I think you have to use the bmw long life oil rating.
SOURCE: BMW 320i year2002 e46
I don't think your trouble is on the ignition side of it but I am sure that you must have a look at the idle speed control(stepper motor).
If with temperatuer your "misfire"changes to better, it means that it's probably running too lean at cold, normally the stepper motor or ISC does this job.
Let us know how you get on.
Cheers.
SOURCE: a battery sign appears in my car gage for BMW
Check & clean all battery connections first, see if that helps, then if not, Have your battery & charging system checked, such as alternator. It's trying to tell you somethings not right.
SOURCE: BMW 320i is using 5L of oil every 1000miles no
Try using an automotive dye in the oil the oil has to be going somewhere the dye should reveal the loose gasket or loose oil plug in which the leak may only occur at speed under pressure and not present when stopped
SOURCE: my bmw 320i e46 just been service useing alot oil
The oil has to be going somewhere, do you drive it really hard? Is it smoking at all?
SOURCE: Can you provide a diagram
hi try this site
www.realoem.co.uk
you will find everything on there you will need for your BMW...hope this helps
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