Hello I've had my 1997 5.4 for about 3 years now. In 2018 I replaced a whole bunch of stuff and the plan is to not fix anything over $500 again. Since I've owned it the antifreeze looks awful. It was a shade of pink. I used the thing with the balls in it to test it and it says it is fine. I probably know the answer but would you guys have it flushed and replaced to make it green or just drive it until you have a problem. It is a second vehicle and I put about 100 miles a week on it, but tired of getting stuck.