Actually, I usually don't use more than a quart for flushing. The highest I've ever gone is 2 quarts. At about $1.50 / quart, that's not a waste of money in my opinion.

Larry, I was actually wondering myself about the upper oil pan and whether lifting of the rear can help drain the oil out of it. Well I tried it and I'd say I got about half a quart more out of the car as compared to just driving the front onto ramps. Maybe if the car is parked flat no oil may get trapped in the upper oil pan, but from my results I suspect that if I raise the front before shutting off the engine, some oil is getting trapped there.

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2004 VW Jetta TDI (manual)

Past MB's: '96 E300D, '83 240D, '82 300D, '87 300D, '87 420SEL