when you flush the car out well you pour in what will be 50% of the cooling systems capacity per the manual....then top off with water....because how will you know how much water is trapped in the system before you add......this way you get it dead on without issues.

And yes...it DOES matter that its the right type or not.......due to the aluminum and plastic components in the system......(mostly the aluminum)

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Proud owner of ....
1971 280SE W108
1979 300SD W116
1983 300D W123
1975 Ironhead Sportster chopper
1987 GMC 3/4 ton 4X4 Diesel
1989 Honda Civic (Heavily modified)
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Section 609 MVAC Certified
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"He who fights with monsters might take care lest he thereby become a monster. And if you gaze for long into an abyss, the abyss gazes also into you." - Friedrich Nietzsche