It looks like the Liquivac holds about 2 gallons of juice. No problem for my MB but I'd also like to use it on my Porsche. The oil tank itself holds 7-8 quarts (the block holds another 3.5). . .air cooled cars use lots of oil. . .especially when the oil cooler is in front and the engine is in the rear. Can the Liquivac be stopped, emptied and restarted during an oil change? Will the thing overflow on its own or will it just stop when full?

Looks like a slick system which will save me alot of work.