Hello Scotty and Moderators! I have a 1999 Lincoln Town Car with 93,000 miles on it. It had sat for many years before we got it up and running again a while back. The coolant hasn’t been changed in at least ten years and has turned brown/black/rust colored. Should I drain and fill, or flush the system?  Also, what maintenance would you recommend for a car that has sat for a decade? (The engine was started  every now and then to keep the battery from dying, but it was barely driven once a year. It still starts and runs good though with a little valve train noise, but I think that’s normal for for the 4.6 liter 2 valve, correct me if I’m wrong though!) Thanks for any answers you can give me!