Soon I will be needing to do a brake and clutch fluid change on my 2004 Kawasaki Vulcan 1500, so while at Wal-Mart I was looking around at their brake fluid products and noticed they had Prestone Synthetic Dot 4. Now I'm confused about the word synthetic on the Prestone container. Is there a difference between just Dot 4 which is what I used 2 years ago and the Prestone Synthetic Dot 4? I thought synthetic brake fluid was Dot 5