[TuckerE36]

Original coolant in my 550i is 7 years old, 37k miles, and I've read a lot of mixed information regarding changing the coolant. BMW states lifetime, I don't buy that, every fluid breaks down eventually.

I wanting to buy OEM BMW coolant (then 50/50 mix it). My local dealer, Classic BMW, refused to do the coolant service stating it can cause issues to arise... Are other N63TU owners doing coolant changes?

[EL Jeffe 5]

2013 550i 62k miles still same coolant.
When they did my coolant lines I don't know how much coolant was lost I think they just topped off.
For all I know coolant looks good I have no plans on changing it until 100k
I do not drive my car in winter 👍🏻

[spielnicht]

I just did mine when I had to replace the infamous turbo coolant lines - haven't had any issues. I mean, any work on the coolant system will require draining and I can't see how the dealership claims that could create issues. I didn't do a complete flush because the coolant looked great to me at 68K, just drained it all and refilled it.

[TuckerE36]

Kewl, I think I'm gonna go ahead and change the coolant while I have the lift just to give myself peace of mind, it's super easy from reading the DIY. Good to hear after 7 plus years and decent mileage the factory fill is holding up well.

[spielnicht]

Double check your turbo coolant line T connectors aren't leaking before you do the flush. It's a very common fault on the N63 and best to replace them if you're draining the coolant anyway.

[TuckerE36]

Originally Posted by spielnicht

Double check your turbo coolant line T connectors aren't leaking before you do the flush. It's a very common fault on the N63 and best to replace them if you're draining the coolant anyway.

I’ve inspected all the connects, all still look solid. Wondering if I should just do the connector mod while the coolant is out