My 2017 S75 has covered 92,000 miles and has never had the coolant changed, nor has it needed to be topped up. No evidence of any leaks. Back in 2017 Tesla recommended changing the coolant every 50,000 miles, now they do not suggest a change at all. I changed the final drive oil recently and there was no moisture in it at all. I have no error messages and all of the heating and cooling systems appear to be working just fine. I presume that that colour need not confirm that the coolant requires changing butt I am bothered at how dark the coolant looks and I reckon I should change it for peace of mind. What sort of testing method is recommended in case my concerns are unjustified? Thanks in anticipation. https://photos.app.goo.gl/8FUvo5MeWgXoXSJy7
