I know there are a million coolant threads but I looked and I couldn't find an answer to this one. My check coolant light came on yesterday while I was driving so I pulled over to the local gas station and picked up some Peak 50/50 antifreeze ($10). I waited to get home to put it in and after I put about a quart in I noticed on the jug it said for GM models 2000 and earlier. As you can tell I'm the exact opposite of a mechanic and always bring my X5 to the dealership. Can anyone tell me how big of a problem this is? I haven't turned my car on yet so its all fixable, hopefully.