I did this test on my R129 SL500, this will work on any car though. If your car runs rough or getting noticably bad gas milage I’d suggest doing this. I sold the car in December. Subscribe if you want to know how much I made on it.
Finding Engine Vacuum Leaks With Brake Cleaner – Mercedes R129 or any Car
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Yes this car is already sold. Yes I still have videos on it. In the near future I will realease a video "How much money I made driving an SL500 for two years"