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BMW M5 F90 (2018+) General Forums Mechanical Maintenance: Break-in | Oil & Fluids | Servicing | TSB | Recalls    Low Washer Fluid Warning

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      05-15-2019, 06:51 PM   #1
gpinard
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Low Washer Fluid Warning

A business colleague recommended RainX Washer Fluid additive as a simple way to improve the cleaning power of the washer fluid, particularly in the summer months to clean bugs off the windshield. Being a RainX product it also had the added benefit of beading the water during a rain storm and improving visibility. I have used the original RainX product for years and liked it so this sounded like something worth trying . . . 4 oz in a gallon of washer fluid, pretty simple!

Filled up my reservior as prescribed . . . about a week later I noticed a Low Washer Fluid Warning. I was surprised that I had gone through that much washer fluid so quickly and when I went to top it up it was virtually full.

Car was in for an oil change today and asked them to look at it. Mechanic asked if I used the RainX additive. Said there was BMW technical bulletin and it coats the sensor causing it to give a false warning. He emptied the reservoir and refilled with fresh washer fluid - warning is still on and he said it is likely to take a few flushes to clear it.

Thought I would share in case you were contemplating a washer fluid additive - not sure if they all impact the sensor but the RainX product certainly does.
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      05-15-2019, 08:04 PM   #2
josec70
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Quote:
Originally Posted by gpinard View Post
A business colleague recommended RainX Washer Fluid additive as a simple way to improve the cleaning power of the washer fluid, particularly in the summer months to clean bugs off the windshield. Being a RainX product it also had the added benefit of beading the water during a rain storm and improving visibility. I have used the original RainX product for years and liked it so this sounded like something worth trying . . . 4 oz in a gallon of washer fluid, pretty simple!

Filled up my reservior as prescribed . . . about a week later I noticed a Low Washer Fluid Warning. I was surprised that I had gone through that much washer fluid so quickly and when I went to top it up it was virtually full.

Car was in for an oil change today and asked them to look at it. Mechanic asked if I used the RainX additive. Said there was BMW technical bulletin and it coats the sensor causing it to give a false warning. He emptied the reservoir and refilled with fresh washer fluid - warning is still on and he said it is likely to take a few flushes to clear it.

Thought I would share in case you were contemplating a washer fluid additive - not sure if they all impact the sensor but the RainX product certainly does.
Thanks for sharing.
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