Suitable coolant / Corrosion inhibitor.

[Ken Smith]

Good day,
I use Caterpillar coolant in all my vehicles petrol and diesel, it is reasonably priced and does a good job keeping the coolant systems rust free. They also have an extender that you can use to recharge the coolant.
We use it in our Cat engined machines and trucks at work that are left out in all weathers, the only problem we have is in cold weather when the coolant pipes shrink and then there is a small weep at the hose. We either tighten the clamps a bit or when the engine warms up and the pipes expand the weep stops.
Ken