An EWK (brand) pneumatic/manual pump, attaching it to an air hose from a small air compressor is the way to go. Just wiggle the syphon tube around a little at the end and it seems to get almost everything that may be left. Suction seems almost strong enough to pull out a small piston!
I tried 2 hand pumps in the past, and both were worthless for the effort and results as compared to the pneumatic.
As for warranty problems: the best you can do is save the oil purchase receipts and document date and engine hours at time of oil changes.