We do have to moderate a large number of posts worded almost identically to yours from members who are attempting to advertise vehicles contrary to the forum guidelines. We endeavour to moderate all posts fairly, but must do so at face value without the benefit of knowing the posters actual intentions and, regardless of your actual intentions, your post was judged not to comply.
I should say post(s), in fact, because you posted the same text 5 times before being asked to refrain.

Had you simply asked your two questions without mentioning an impending sale then we, no doubt, would not have judged the post to be breaching the guidelines.
..and as to freedom of speech, we try to allow as wide a range of discussion as possible here but complete freedom of speech would not result in the site we have today. Ultimately the boundaries are set by the forum guidelines for a multitude of reasons; some legal, some reflecting our desire to maintain a pleasant "family" site and some to avoid members getting ripped off by those who join up only to sell a car.
Hopefully you can appreciate the reasons behind the moderation of your posts.