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Are you implying there's some fancy vacuum gadget that successfully sucks old oil out the dipstick filler [wot - all of it]? If so, how much please?
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I use this one:
http://www.lidl.co.uk/en/our-offers-...&id=31292&ar=3
As for getting all oil out, well you never get 100% oil out even when draining through the plug in the sump, but there is really not much difference whether you leave 1 % or 2% of old oil in the engine, on some engines apparently you can get more oil by sucking it out rather than draining. But it does save time and labour, you do not need a ramp and no need to lift the car, undo undertray. Many garages do it the same way and from what I have heard some models does not have drain plug at all so the only way is to suck it out from the top. I change the oil more often then required in service schedule anyway.
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And what oil do you guys use at under £50. Do you need the Castrol Edge stuff or something else?
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Same stuff that Audi dealers use Quantum Longlife III 5W30 I think not all 3.0TDI engines have the same oil capacity but should be somewhere 5.5-7.5l
http://www.ebay.co.uk/itm/x2-Quantum...kAAOSwKtlWqe5y or
http://www.ebay.co.uk/itm/Quantum-II...kAAMXQfvlSlzmM