Hello everyone this is my first post on this board. I need some advice. I have an 02 Taurus with the Vulcan engine. Its a slow reving low rpm torque engine. It has 19,000 miles had it since new. Should I use the Ford 5w 20w or go with something else? I live in south fla. Its HOT!!. I change it every 2500 miles. I have no problem going with a synthetic and letting it stay in longer. What do you guys think?