Oil suction tools?

[BTGuard]

Anyone use any of these tools that suck oil out through the dipstick? Thinking about getting one so I can change oil without the shop a little easier. Any opinions?

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[Marion]

I used one on a boat I had years ago, it worked pretty well .

[WhiplashTX]

They work great and I got more oil out of my VW TDI than using the drain plug because I could pump out the filter canister also. Just be aware that they won't work on all vehicles because of the dip stick location or oil pan shape. I could only get about 2/3 the oil out of my Lotus because of a shelf in the oil pan prevented the suction tube from reaching the lowest point in the pan.