Isuzu D-Max Problems

With just the one car affected you can safely assume it's not the fuel that was the problem. Water entry through the fuel tank breather is one possible explanation, and it would be well worthwhile looking at relocating the breather to avoid the possibility.

It's a common complaint about diesels since we went to common-rail engines. Some claim it can be fixed be recalibrating the computer, others say the injectors need replacing. Consult a diesel engine expert.

Coolant should be changed regularly, annually at least, but the interval should be shown in your service book. It can look a little oily, but that's not a problem, and as your vehicle is running well with no sign of a problem I wouldn't be concerned, but do change the coolant.

Good advice. With more people getting into diesels these days they should spend some time reading the owner's manual to understand the differences between a diesel and the petrol-powered cars they used to drive.