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Well clearly it is safer to have the Car on jack stands and not running.
However on the vehicles you have in your profile; 1981 300d, 1985 300d turbo if you block both front and rear of the front Wheels you can raise the rear wheels and put the Jack Stands under the rear Subfame Bushings.
You can do the same with the front wheels on ramps but with the ramps it is not so easy to block the front wheels. It also means the jack stands need to be extended higher. The advantage is you have more room to get under they Car.
Anytime you are under a car it is a good idea to have a mind set that you may need to get out from under there fast.
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84 300D, 82 Volvo 244Gl Diesel
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