What should the ideal coolant temp be for the 3.5 V8 on S.U.'s? I'm currently running an 88c thermostat (a spare from my first Range Rover)- temp of the intake manifold at thermo housing taken with an infrared thermometer is 85-86c after a 10 mile run. Needle on the gauge sits right on the "5". I know this has been discussed before.... what's the general opinion? Thanks in advance, Steve.