1967 250SE, 2004 E500, 2005 C320, 2006 SL500, 2020 GLB250
Discussion Starter · #1 ·
Is there any simpler test like a pH strip? I just realized that my 240K miles W211 has the factory original coolant in it. It always had the same level and color since new so I didn't pay much attention but 240K may be pushing it.