2x on letting sleeping dogs lie. Flush with good quality water. The amount of water that gets left in the block is less than what's required for the correct coolant / water ratio. You know the total system capacity, so add straight coolant to start with. It's better to have a too strong mix than a too weak one.
-J
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1991 350SDL. 230,000 miles (new motor @ 150,000). Blown head gasket
Tesla Model 3. 205,000 miles. Been to 48 states!
Past: A fleet of VW TDIs.... including a V10,a Dieselgate Passat, and 2 ECOdiesels.
2014 Cadillac ELR
2013 Fiat 500E.
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