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An oil and filter change is probably the most simple bit of car maintenance and I would never think of trusting a 'mechanic' with my Spider. I had an unfortunate experience with a 'specialist' doing a cam-belt so probably my judgement is a bit clouded, however the previous service history of my car is long and detailed - I have found many a bodged job that cost the previous owner a mint. If you do use a garage make sure they take care in putting it on a lift, most 916's suffer from crushed sills.....
On a positive note - have a go, learn by your mistakes and yes take care. Low level trolly jack it up and with 4 axle stands under the subframes will be perfectly safe. Mine is off the road for the winter and is sitting quietly wheels off waiting for its annual oil/filter change and this year new brake pipes, fluid, front discs and pads all round.
 

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Crushed sill is usually caused by tow Post ramps. Best use a 4 post and sills will be safe. Best check with garage that they have 4 post if you decide to use a garage...
 

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I agree with your process but not your statement above. This is a straightforward beam reaction/moments problem, the sort my sixth formers did. In the attached diagram just imagine the vehicle at an angle to the horizontal such as if on ramps or two axle stands and use perpendicular distances instead. Depending on how far the centre of gravity centre of mass is from the front and rear contact patches the division of forces front to rear is going to be around the 50% each, just same as if the car is on the level.
In the example I've deliberately moved the centre of gravity or centre of mass ( in this case we can assume they're the same) forward to give widely different numbers front to rear.
Maybe I should have said 99.9% of the weight. My point is that the jack is an additional safety measure only. I could take it away, and leave the car on the stands quite happily - indeed on very long welding jobs where I need the access, this is what I do. But for a quick in and out. the car is on the stands, I鈥檒l leave the trolley jack in position, barely taking any weight because I have released it, and locked it a mm or so down from the lift point.
 

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I've done exactly the same but only if on a concrete base. I also use bottle jacks but not as in 'Ice Cold in Alex'. A must see film on t.v. when my dad was alive as he'd been there.

Oh, and those pressed steel scissor jacks that come with cars are definitely not reliable enough to do anything.
 

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I've done exactly the same but only if on a concrete base. I also use bottle jacks but not as in 'Ice Cold in Alex'. A must see film on t.v. when my dad was alive as he'd been there.
The Carlsberg beer glasses they drink out of at the end is my outstanding memory of that film!

 
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