What I did/do is run the tank almost empty 1-2 gallons and then add to the tank and drive it pretty hard or at least so it gets warm. For 6 bucks it's a deal compared to having a shop do the same thing. I think you can add it through a vacuum line but the tank is easier. Thanks

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83 300D 227,xxx miles, sold
86 300 SDL 130,000 miles, sold