Only performed one empty and re-fill. I will stand on the WAG. Vehical is Canadan Ford AeroStar van. Got it free and < 6 Months hope it to be gone more than likely Car crusher. BF my guess 180K miles old, I think I will take LOAFER’s suggestion and just watch the brakes for now. Vehicle almost never goes over 50 MPH and only 20 miles round trip to work. Thank you all five (5). It let’s me know I am not alone and going in the same direction for now. I will keep a close eye on it. Thank you again. Mrsherlock