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Easy to do at home and very simple service too. I only use Havoline Extended Life concentrated additive, 3 liters and topped up with regular tap water and I've had this car for 20 years and the temperature hasn't changed, seriously, I think I can trust it now. Thermostatic valve always refill MTE 211-82, I always change it every 2 years and sometimes 2. More videos on my channel: / paulodealmeida-babado