Help! Refilling coolant!

ULTSUJB to Mechanic Advice@gearhead.townEnglish · 10 months ago

Hey guys! So my friend got a low coolant light on her 2021 BMW 330i xdrive. We’re planning on doing it ourselves, however I have a few questions.

Is it okay to mix coolants? We’re going to use PEAK pre-diluted coolant and I’m pretty sure my friend car has the original BMW coolant since she has gotten all her service done there.
Do we need to drain the old coolant?

Thanks everyone!

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