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• JonM

  Member Since: 30 Jun 2016

  Location: North Yorkshire

  Posts: 690

   

  

  A cool(ant) question

  Ok. I'm going to aim for the dullest post of the month award.... Who knows about coolant? My previous Discoverys since my 2012 D4 and two D5s up to my 2022 D300 have all used "Mixture of 50% water and 50% Havoline XLC anti-freeze, meeting Jaguar Land Rover specification STJLR.651.5003" but it seems that my new 2026 D350 requires "Mixture of 50% water and 50% antifreeze meeting Jaguar Land Rover specification STJLR.03.5212".
  
  What's the difference? They both seem to be OAT coolants are they the same? What would happen if I topped up the D350 with the STJLR.651.5003 coolant I already have?
  

  ---

  MY2026 D5 Metropolitan D350 - finally arrived after the cyber attack.
  MY2022 D5 HSE D300 - sold....MY2019 D5 HSE SD6 - sold
  Post #42472 3rd Mar 2026 8:46 pm

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