As posted above you can't see the coolant levels at the marks at rear of tank as its not see through. You can see the level from the front by the exhaust header and this is usually enough to give a good indication of level. If non to be seen there then it needs topping up. I dont think it uses OAT based antifreeze as they are usually orange from my experience so I'd get an Ethyl Glycol based one for topping up (spelling may be a bit off and others may have a different view).