hi mate for light green laning any version of the frontera would be ok

the diesel version is better on fuel and on average is a better & more reliable engine than the petrol .
things to check other that the usual things are that the 4wd system works as it should so by pushing the button on the dashboard you should get a solid green light which shows 4wd has engaged, if it flashes then it has not and theres obviously a problem. but be warned 4wd should only be selected when on slippery surfaces, its ok to check while driving slowly in a straight line, turning on hard surfaces can cause damage.
normal operating temperature is approx 85 degrees but standing traffic conditions will see the temp rise to approx 100 degrees when the fans should cool it down to 85 ish again, being a ford man i found that quite an eye opener when i brought mine

if it runs much cooler than that the stat may of been removed to hide cooling problems, the 2.2 petrol is renown for head gasket failure which with that engine is a case of when and not if so id see if theres any history to show its been changed, mine went at 56k and it had quite a bit of service history.
when starting the eml should light up and go off after starting so if it dosent the bulb may of been removed again to hide any faults.