I have a 1999 Civic SI EM1 body. It has 70,000 miles on the body and I just had the engine completely rebuilt and it has a 100 mi on it. I drive it very little. Maybe 300 miles a year is planned. I've only driven it 40 miles in the last 4 months. I have it in my garage under a cover with a battery tender. How often do you think I should change the oil on this thing? Every 6 months? I'm thinking that would probably be the best thing to do and I'm not sure that synthetic oil would be necessary with those sort of oil change intervals. What do you think?