Welcome to the herd! Lots of friendly knowlegable folk in these forums.
To keep your ride happy,
every 100kMiles\12Yrs:
* V6~4.0L~SOHC EnginPanDrop + New PanGasket To Clean OilScreen & Look For TimingBrokens
* New OilPressurized TimingTensioners
* New Aluminum ThermoStatHousing, Replace Original Plastic Version
* New CoolantHoses+Clamps+Radiator+Pump+HeaterControlValve+PlasticFittings
* New FanPlasticBlade+FanClutch If Fitted
* New Belt+BeltTensioner
* New IgnitionPlugs+Wires & OxSensors
* Remove+Clean DashCenterPanel+LeftCluster+ColumnCover, Tighten Connections+Sockets, Renew Bulbs
* ...
every 33kMiles\4Yrs:
* New Coolant+ThermoStat+Rad\PressureCap+PCVValve
* Clean+Inspect MAFSensor & ThrottleBody+IACValve+IntakeManifold & EGRValve+DPFE+RiserTubes
* Clean+Tighten BattTerminals, Volts Off\IdleCold\IdleWarm Should Be 12.2~12.6v\14.0~14.5v\13.5~14.0v
* 5r55eTrans PanDrop + Torq VBBolts + New Filter + New PanGasket + New 5~6qt MercV + BandAdjust
* New MercLV. For 1354 4x4TCase If Fitted
* New 75w140.FullSyn+Modifier For Diffs, Clean+Inspect Vents+Hoses
* New BrakePads & Inspect Rotors+Calipers, Test+Lube PBrake+PedalSwitch+DashLamp
* Inspect UnderBody Exhaust+DriveTrain+Suspension+Mts+Panels, Clean+Paint+Lube+Repair As Needed
* Inspect ExeriorBody+DoorSeals+Windows, Clean+PaintTouchUp+Repair As Needed
* ...
every 5kMiles\6Mths:
* New Oil+Filter To Discourage Sludging+Failure Of V6~4.0L~SOHC TimingTensioners
* HandPump 3/4qt From TransDipTube, MercV Refresh
* HandPump 1/4qt From SteeringReservoir, MercV Refresh
* HandPump BrakeReservoir, DOT4 Refresh
* Excercise 5r55e Trans OverDriveButton+IndicatorLamp, ShiftStemWire Is A NotoriousFailureItem
* Excercise 1354 4x4TCase 2WHi~4WHi~4WLo, ShiftMotor+ConMod Are NotoriousFailureItems
* Inspect+Test Fixtures+Bulbs, Replace As Needed
* Inspect+SiliconeLube IgnitionSwitch+Hinges+Locks+Windows
* Bottle Of FuelCleaner (Lucas\Equal) + PremiumFillUp To Minimiz Gum+Varnish
* ...