What's different about a 4WD or diesel
Diesels run hotter and work harder, with an injection system built to tight tolerances and a turbo on nearly every modern engine. Clean fuel and fresh oil at the right interval count for more here than on a small petrol car. Newer diesels also have a particulate filter in the exhaust, which needs regular hot running to stay clear.
A four-wheel drive adds a transfer case, front and rear differentials and heavier suspension, and each has its own oil and its own service interval. Towing and dirt roads wear all of that faster, and most service books set a tougher schedule for it.
4WDs and diesels around Melbourne
City kilometres, country trips
Plenty of Melbourne utes do the school run all week and the High Country at Easter. Short city trips are hard on a particulate filter, so a warning light after a run of them is common. Tell the mechanic how the car is really used.
Before a long trip
If you're heading to the High Country or further, have the cooling system, belts, tyres and suspension looked at with enough time to get parts, because the time to find a tired part is before you leave Melbourne.
Victoria's rules
Selling a modified 4WD in Victoria still needs a roadworthy certificate from a licensed vehicle tester. Mention any lift kit or larger tyres when you ask for the inspection.
What to ask a 4WD or diesel mechanic
- Do you work on this make and engine regularly?
- Which schedule fits how I use the car, the normal one or the severe one in the book?
- What fuel and oil filters do you use, and do they meet the maker's specification?
- Will you check the differential and transfer case oils at this service?
Where we'd start
We'd pick "4WD or diesel" by telling us the model in the card, then put how the car is used in the note: towing, off-road, mostly city. That one line is what separates a mechanic who suggests the right schedule from one who follows the short list.