I am starting to twitch violently about Comma's change of website recommendation from their XStream G48 antifreeze to XStream G64 as being suitable for the old 'red blocks'. I now see the information on the website says G64 is "specifically designed for modern downsized engines ... " , AND although Ethylene Glycol based, the product description mentions "containing an inhibitor package based on ..... and silicate (Psi-OAT coolant)".
Until I receive some clarification from Comma, I would suggest you do not even consider mixing Comma XStream G64 with existing coolant in your car.
Bob
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