Yes you can freeze.
This is a very moist chocolate cake and why you have to let cool in the cake tin for a bit before turning out or it will fall apart.
The cake is not only moist but a nice crust on the outside, the top may crack while cooking, don't worry about it. To hide just ice it and sprinkle on coconut like I did.
You can cut the oil down a bit but that will take away some of that moistness.
The darkness of your cake, like all chocolate cakes will depend on your brand of cocoa. Mine turn out darker than my mums as we use different brands.
This can also be made in 1 large 33x23cm slice tray, keep an eye on baking times if you change the cake tin dimensions.
I made this cake as picture shows in 2 loaf tins