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E90 M3 (Sedan) | E92 M3 (Coupe) | E93 M3 (Convertible) (2008-2013) {Engine: S65 - Max Hp: 414 hp (420 hp Euro) at 8,300 rpm / 295 lb/ft at 3,900 rpm}


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Old Mon, Sep-02-2019, 02:40:45 AM   #1
darnelld
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Default Topped of coolant without mixing distilled water

Hey all.. kind f had a brain freeze and topped off my coolant with straight BMW antifreeze. It wasn’t much, just to get the indicator up. Thoughts on if I should be majorly concerned and bleed the entire system? I would think since it was so little maybe it would be ok... maybe add some distilled water to the tank


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Old Mon, Sep-02-2019, 07:45:45 PM   #2
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Default Re: Topped of coolant without mixing distilled water

I would not worry unless you put in enough to change the mixture substantially. It is a 12 quart system. If you are really OCD, siphon out the reservoir and refill with just distilled water. I’ll let you do the math to figure out how to compensate with water for the amount of pure coolant you put in.
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Discussing Topped of coolant without mixing distilled water in the E90 M3 (Sedan) | E92 M3 (Coupe) | E93 M3 (Convertible) (2008-2013) Forum - {Engine: S65 - Max Hp: 414 hp (420 hp Euro) at 8,300 rpm / 295 lb/ft at 3,900 rpm} at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)