I bought a 2000 Bonneville SSEI back in April. It only had 18K miles on it, but I've already put on 6K miles and am going to be getting the oil changed and tires rotated soon. I've been wondering about the supercharger oil and read posts on here that said it should be changed every two years or 55K miles. Because I'm not sure about the maintenace history before I bought my car I figure I'll just take care of it now to be on the safe side. So, my question is - Do I have to change the supercharger oil or just fill it if it'* low? If I do change it now what would a good schedule be after that? Thanks!