Quote:
Originally Posted by engatwork
Zerex G40 is the latest for MB. Does anyone know whether it is ok to use in the older cars? I would think it would be ok as long as it is not mixed with anything that is not compatible.
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One would assume if the entire system is squeaky clean it would be ok, but with older vehicles that have been using opaque green coolant, its internal crusted deposits can cause gelling. I believe a good dose of citric acid would clean that off - and a good 10 minute powerflushing.