you all sure like doing things the hard way. Buy a lube oil pump from your local automotive shop. they look like big liquid hand soap pumps that fit inside the bottle and pump thru a small tube into the differential. usually takes 20-30 pumps to empty a quart container. I paid $5 for this device about a year ago and have used it nearly daily with no problems.

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Matt
2003 Jetta Wagon TDI 145,000MI
1999.5 Jetta TDI 287,000MI
2001 Suzuki SV650S 26,000MI
2008 Yamaha Vino 125 11,000MI
http://www.crazymatt.org