I was working at a civil/military airfield in Libya some years ago. Near to our hangar were a few Military Mi-8 machines that we all assumed were waiting for disposal as they had no covers or blanks of any kind, were covered in dust and sand and we saw no activity there for months. Then one day a truck pulled up, a few people got out, opened the Mi-8 cowlings, put some oil in, scraped the dust off the cockpit windows, started up and took off. Try doing that in a Western machine.