I am considering the purchase of a 2002 BMW 330 convertible. The specs state that it requires premium fuel. I read in an article recently that some vehicles can sense the use of regular(87 octane) and adjust the engine to satisfactorily run on regular, although with some loss in performance.
1/. When the specs indicate "premium", is it calling for 89 octane, or something higher?
2/. Will the 2002 BMW 330 operate satisfactorily on 87 octane? Performance is not an issue with me.