Thanks NC240D76, but look at this: MB service manual Eng. 104 Part no. S-2599-093 Copywright 1993
Use water which is clean and not too hard. Drinking water frequently, but not always satifies requirements. The content of dissolved substances in water may lead to corrosion. If in doubt use distilled water.
Not sure what to think now. Sounds like maybe last resort use distilled, but never says its a problem. Iwill have to check around on this. Thanks for attention NC240D76
71 Chevelle SS 454