Mr. Detail--changed out the coolant in my 97 turbo wagon last winter. Worthless Haynes manual said something like 7 or 7.4 liters. Put a pan under it and drained out 3 and a half. Filled reservoir with water, started engine, waited until reservoir boiled, and then drained it again. Still three and a half. Did this two more times. Realized, after locating the pit cock up on the back side of the head and the one at the bottom by the radiator, I wasn't going to get more than that out of it. Took my one gallon of antifreeze and poured three liters uncut into the reservoir to mix with what was still trapped in the block. Took the remaining liter in the container and added a liter of water. Took about half a liter of that to bring the level up to max. Never did hear an explanation of from any one on the BB why I couldn't drain out all 7 or 7.4 liters. Measure carefully what comes out so you know how much is still in the engine. Be sure to turn the heat control all the way up and the fan on high when you refill with water so it will circulate through the heater radiator as well (something I forgot to do). Measure the amount you drain out each time so you know exactly how much is left in order to fill with uncut. Do NOT cut all your antifreeze before you drain the radiator. If there's three liters left inside the engine, you will not achieve your 50/50 mixture. We're not talking freeze protection here, we're talking lubricating the water pump. That's first and foremost why you need that 50/50 mixture. Dick