This is really for the bluespark guys on the forum, as I know it gets asked a lot, more so on the facebook groups etc but it would be good to know what settings you recommend.
For example, setting C on a standard car. But setting D for cars with an exhaust and filter perhaps? I'm not saying that is the correct theory, but I've seen it asked a few times and people's replies vary so much.
The paperwork with the boxes states that it's probably best to leave it on setting C, but at what point is D and E recommended?
Thanks.