My brothers 1991 Buick Park Avenue has been losing coolant for some time. We noticed the reservoir kept getting low at first so he just keep topping it off, but recently he hasn't kept up with keeping it topped off. I checked the radiator today and its a smidge low, but also has some floaties in it. We are hoping its not engine oil as that would spell bad news. I checked the oil and there was no milkiness on the dip stick or in the cap. What do you guys think? Here are some pics....