Hi,

I have a EE9 (B16A1), with about 140.000km. In the last few years i rarely drive the car... About 500-1000km per year. The car is being great and never gave me any major issue. Itīs not tuned, itīs almost stock.

Last year, i did a big maintenance with oil, coolant, timing belt kit change and some other minor things.

However yesterday when i was checking the fluid levels i found something very odd. The coolant was a little low (but i think this can be normal because i never topped it up since the last change) and i topped it up with distilled water.

But... i found something odd floating in the coolant, like you can see in the following pictures:








I took off some of that strange thing but i left some so the mechanic can see it later. The thing was white and looked like a chewed gum.

Today i looked again and decided to take off the rest. But the color wasnīt totally white but like greenish/light brown.

The oil level is ok and it looks fine. It never burnt any oil. The car never overheated either. But iīm still afraid it can be oil.

Iīve read it can be some aluminium residues or some crystallization process due to the car been parked so much time and green coolant is prove to that? Iīm not sure which coolant color it had before but i think it wasnīt green.

Here two movies iīve made of that strange thing.

What do you thing?

 

You'd be surprised at what bacteria's and fungi can grow in strange conditions.

I've seen a sludgy build up like that before in many coolant reservoirs. I doubt it's oil and I do think it's part in due to long periods of sitting.

Running the car warms the fluid up as the hot coolant pushes into the reservoir and then pulls it back out on cooling. I suspect that reduces bio growths.

I wouldn't worry about it, especially since you can pull it out.

Also even OEM coolant is a blue green (more blue than green) but most other coolants (including what most shops put in our Hondas) is green.