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I dont think so, if it was better to suck the oil out the top of the engine, car manufacturers would recommend this and sell you the tool to do it.

I doubt you'd be able to remove as much oil also. its better to drain via gravity.
 

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Definitely not on an LP, as all you would get out is the oil in the sump tank. Which is about 15% of all the oil. There are 7 drain plugs for a reason on an LP.
 

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The reason there are seven drain points is because the oil hides in those points and must be drained.
 

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I agree with all of the above. Also because there is a high chance you'd leave sediment.

And changing the oil by draining it gives you a chance to check everything underneath
 
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