There are lots and lots and lots of opinions. Most of them are half baked
I get the oil in my 325 every 7500 miles. Since my car sees mostly local
driving, I believe that it pays to be cautious. And, the suggestion is
every 15000 miles for my car.
Yes, oil changes are more expensive than they were once upon a time.
Synthetic oil is not cheap, nor are filters, nor are workers.
A guy I used to work with ran a really old 80's 318 (not even a 318i If I
He used to change the oil twice a year and up until a couple of years ago
when i left work his car I admit sounded just like a sowing machine - really
smooth better than my (then) nearly new 325 convertible
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