Buying A Roush Mustang - Oh Yeah!

Should I change to heavier engine oil? 25 Corolla e85 in a non-flex fuel vehicle, or no? Repeat new alternator replacement. Nissan Pathfinder Buying a 2014 Roush Mustang. Oh Yeah! At home scan tools for cars. Which one is best for me? 17 Malibu repeat battery drain Green fluid under my car with pink coolant. Check engine light on is there a warranty?