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- JonM
- Member Since: 30 Jun 2016
- Location: North Yorkshire
- Posts: 692
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
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- discus
- Member Since: 22 Aug 2019
- Location: North
- Posts: 189
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According to Google AI, no idea how correct it is, doesn't seem to agree with your manual!
Quote:
Based on Jaguar Land Rover technical specifications, STJLR.651.5003 is the current, primary, and recommended coolant specification for nearly all modern Land Rover and Jaguar vehicles.
STJLR.03.5212 is an older, alternative specification that may still appear in older technical documentation (such as for the Freelander 2 or certain V6/V8 engines), but for general, current service, 651.5003 is the required standard.
Key Comparison
STJLR.651.5003 (The Standard): This is an Extended Life Coolant (XLC), typically red or pink in color. It is a phosphate-free, silicate-free, ethylene glycol-based coolant that uses Organic Acid Technology (OAT).
STJLR.03.5212 (Older Spec): This is also an orange-colored, silicate-free, OAT-based coolant.
Compatibility: While some products may list both, STJLR.651.5003 is the standard recommended by dealers and in recent owners' manuals for most modern models.
2024 Discovery Metropolitan D300 - Offroad & Towing Packs - Varesine Blue
2019 Discovery HSE SDV6
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- JonM
- Member Since: 30 Jun 2016
- Location: North Yorkshire
- Posts: 692
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Never trust AI, look what happened in Terminator
According to the LR iGuide, up to and including MY2024 was STJLR.651.5003 then MY2025 & 2026 are STJLR.03.5212. I don't know why they changed, but the coolant in my current D5 is definitely a slightly different colour and viscosity to what is in my top-up bottle that was used on my previous discoverys.
MY2026 D5 Metropolitan D350 - finally arrived after the cyber attack.
MY2022 D5 HSE D300 - sold....MY2019 D5 HSE SD6 - sold
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