Can change oil in 20 minutes--no mess--really works well. The only thing I wish it had was a removable top so it could be cleaned and wiped down on the inside. Suggest replacing oil filter with extended range filter and change it every second oil change. I suck out the oil and mark the side of the unit with felt marker. Empty the used oil and gravity drain the unit, then add new oil to the mark and reverse the process. Caution, NEVER put solvents of any kind in the unit. It will damage the seals. I would buy again!