I have a year 2000 Johnson 40HP. Just a few question about 2 cycle engines in general. 1. Should I run Premium (92) or Regular (87) gas? 2. Is it normal for the carbs to be slightly wet with gas/oil? I mean very lightly, but they are not completely dry. 3. Is sooty oil accumulating on my boat transom normal? I have a 1ft section of deck that catches water and drains it back out the boat while running, the top of it gets dirty with oil/soot after using the boat a few months Thanks in advance.