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.
Questions:
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.