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2016 535i, 2019 Q5
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5,655 Posts
I found that too flexible of a hose simply caved under the suction pressure...did your hose function fine?

I’d like to do mine again soon as I feel like I want to get more out this time and can’t hurt to dilute again
 

· Registered
2016 535i, 2019 Q5
Joined
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5,655 Posts
You need access to the very top fill port. Filling via the inspection port ends up being underfilled based on the way internal design. Its an extra 10mins to do it right.
 

· Registered
2016 535i, 2019 Q5
Joined
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5,655 Posts
Because AFAIK you will be 200-300ml underfilled by using the inspection port. The fluid capacity is about 650ml or so, but if you drain after filling via inspection port, you'll suddenly find you only put in ~400ml. Something about an air lock, hence why MB has a top fill port.

I originally filled via inspection, realized the mistake and went back and redid it correctly.
 
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