pull the oil dip stick if its just oil its fine. its the na engines that eat the coolant via a failed upper intake.
top it off, keep an eye on it.
if its full the coolant sensor in the rad could be dirty and tossing a false signal too.
when topping it off it might be best to run it cap off till the fans come on, this way you know the t stat is open and coolant is flowing through the engine. when th et stat opens i could take more coolant. then check it cold the next morning, it should full to the top of the cap maybe even spill out a bit.
also make sure the over flow tank has coolant in it too. if it leaks, theres your coolant loss.
