My Wal-Mart has it for $4.00CDN, if you buy it when they have "special purchase" 5L containers. When they do, I buy about a year's worth. I have 30L left right now.
Most of our quality dino-oil goes for about $2.50-$3.50 a litre.
Most dealers charge $10 and up per litre for Mobil 1 during an oil change:
7x$10.00 - oil = $70.00
1x$13.50 - filter = $13.50
Labour "special" = $49.95
Total = $133.45 plus taxes and disposal.
7x$4.00 = $28.00
1x$13.50 = $13.50
Total = $41.50.
(my local gas station takes used oil for free)
My first DIY oil change saved back more than the cost of the LiquiVac.
1998 C230 "Black Betty"