I brought my BMW in for a diagnostic check on fluids that may need to be drained and filled. Michael was very informative on what was really needed and performed a diagnostic . Thank goodness nothing needed to be done . But as I left I got a coolant warning so I called him and he said it probably is just a hair low. My husband filled over a quart when we got home plus two lights were out . Maybe they just felt they needed to check the brake , transmission and steering fluids but I guess I thought a full diagnostic was being done. Nevertheless I will be a little more clear when handling these matters .