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If you are having any kind of odd engine problem that your mechanic can not seem to fix, then you must give Berkebile 2+2 Isopropyl Gas Line Anti-Freeze a try. It is far more than a gas line anti-freeze, this stuff fixes engine performance issues. It cleans the file system out and your care will run great. Just give it a try, 1 bottle for the next 3 to 4 tank fulls and your car will be running better than ever.