As the thread title suggests.
As any Audi owner would know, the stock jack supplied with our cars is probably one of the most dangerous tools any manufacturer could include with a car. The design hasn't changed since its inception in the late 1970's, when it was supplied with the B2 Audi 80 / Fox. The finish, metal and color may be different today, but it's still the same murderous implement it's always been.
With the Audi Fox, the design flaws were less pronounced, as the Fox was quite a light car, with the heaviest weighing in at around 850 kgs. Today, modern Audi's are much heavier, but Audi has not made any adjustments to the lifting jack. I remember changing a flat tyre on my 2002 D2 S8, and the jack actually began to bend, before the front tyre was even clear of the ground. I ended up grabbing a lift to the nearest tool shop to purchase a 2-ton hydraulic trolley jack.
With my 2005 D3 A8 4.2 Quattro Sport, I never even attempted using the Audi supplied jack, preferring to use a trolley jack at home. I never had a puncture away from home, and if I did, I would have purchased a bottle jack, or got the AA out.
On another occasion, while I was changing a flat tyre on my old B5 1.9 TDI by the side of the road, I had the wheel off, when a mini van roared past, doing around 80 mph. The resultant slipstream was enough to blow the unsteady car off the jack, which collapsed. I just had time to snatch my hand back, before it was mashed under the car. The jack actually punched a jagged hole in the floor pan as it twisted under the car.
I've never used the Audi jack again.
Trolley jacks are great for home use, but hardly practical to carry around in the car. It's too big, and there's no real way to store it neatly, despite many coming in a fancy plastic carry case these days.
So, hydraulic bottle jacks. Great for lifting and supporting, though cars running really low can be a problem. A decent 2-ton jack may be ideal, as the ram is most likely to have enough threaded adjustment to have it really low. 10-ton jacks are likely to be taller, and may not fit under slammed cars, even if the top is screwed right in.
I've just ordered a 10-ton jack, as I won't be running my car really low.
So guys, what jack do you carry in your trunk, as your car jack? Trolley? Bottle? Scissor? Audi's finest widow maker? Let's see yours!
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