Help!!!
 

I drive a 1991 300E, and today i decided to flush the radiator because it has been a couple years.

So I crawl under the car and find the drain plug mentioned in the service cd's, and drain all the old stuff out.

I then use prestone radiator flush to clean out the system, and drained that out.

But when the time came to fill up the resevoir, the system only took 6 quarts. The service cd's and the owner's bible both say it takes 10, yet mine only took 6. I even ran then engine till it was above 80 degrees and ran the heater as well.

Is there something I'm forgetting? Or is there another place I have to drain the coolant from?

Any help would be appreciated. Thanks in advance.
-E

And I forgot to mention the main problem:

When refilling the coolant, assuming the system would take 10 quarts, I went ahead and added a gallon of distilled water first. Not untill i began adding the coolant did i end up filling up the resevoir after only 2 additional quarts.

I have no idea what to do, any help would be appreciated. Thanks
-E