My car is Honda city. Went to an ah Beng workshop and that guy convinced me that all Jap car coolant can be use interchanged. So he sell me this Toyota coolant that is red color and put into my Honda which is originally blue. Not even sure the Toyota coolant is original or not.

Now I worry it will spoil my engine system. So I went to Honda SC at nilai and ask them flush it and refill with original. Not sure the potato understand it correctly or just being lazy? Now my coolant still red in color with a mix of blue-ish.



This post has been edited by exiang: Sep 20 2020, 09:18 AM

Technically, it is the same as both Toyota and Honda uses mainly ethylene glycol based coolant.

The only difference is the colour of their dye. Red vs Blue.

I would say there is no major concern as both are interchangeable but to avoid hassle, I will always stick back to Honda coolant for ease of monitoring the colour of the coolant.

Once you've mixed red with blue, it will be difficult to monitor the colour now unless you do a 100% coolant flush.

personally, i dont recommend mixing coolant. depending on formulation, it can potentially reacts with eachother and either degrade the coolant, or even worse, makes it coagulates / form sediments and clogs ur cooling system.

Not recommended because might get side effect on your radiator?

This post has been edited by Zaryl: Sep 20 2020, 09:51 AM

Flush out and put back long life Honda coolant. Very cheap per litre. Honda long life coolant should last for 10 years or 100,000km. Which ever comes first.

Some coolant like Prestone can mix with any.

ok, drove all the way back to SC and check with the technician again. He did flush the entire system but the tank still got some remaining. They redo it again and now is all blue d.

Total how much the SC charge to flush out the entire coolant for you?

Once i did similar stuff. Foreman at outside workshop added water to my coolant. I wanted to drive my city for a long time. I went back official sc on next weekend just to flush out. Cost me about 200-300.

After that, i bought a bottle of Honda coolant and top up myself from time to time and monitor/specifically ask foreman not to topup my coolant.

I would suggest you to top up using distilled or battery water.

Topping up with coolant will increase the glycol content and you will not have a 50/50 mixture.

Errr.Honda coolant should be premixed 50-50. The bottle says do not dilute with water.

Yes.. initially I am having the same thought as you. However, later I ponder about it.

The reason coolant loss occur is mostly due to heat evaporation. Means that water is being evaporated but the mineral or chemical content will still remain in the car's cooling system. Just like sea water being evaporated and the remains will be salt.

So to maintain the 50/50 ratio, we should add in distilled or battery water. However, I will still drain the coolant after every 3 years with 3 fresh bottle of Honda Type 2 coolant.

That is my opinion.

Do not mix Toyota and Honda coolant, it is not compatible.

coolant in malaysia serves as a anti rust purpose only

since both are "long life coolant", i think it's ok to mix it
but of course recommended not to do so
always flush out thn only refill in with a specific brand/colour of coolant

Your reasoning sounds valid too. Though ill still stick with just coolant

Personally I wouldn't want to mix it. If no choice..drain the whole system ( anyway it's not hard to drain....just fill in water to your tank and remove the return hose and connect that hose to a hosed pipe so you can collect and dispose properly).

Some coolant are fully coolant and can't take water ( like ford orange color coolant). So it's best not to mix

Mixing coolant is fine if they are using the same base chemical. Honda & Toyota should be using same type of coolant so it is not an issue. If you are so worried then get it flushed and replace ori coolant. My advice is no need to be worried. There are 100x more cars out there using pipe water than mixing coolants. That it even worse and they still doing it. LOL...

This post has been edited by abubin: Sep 21 2020, 01:48 PM

To be honest, I never thought coolants were required until I gotten my current ride.

Cos all this while was using old conti cars, and I needed to top up 'water' every few days of use... Maybe awareness wasn't there. My dad taught me to ensure the coolant tank is always full... Few times already my car overheated whilst driving. Not sure if it was due to the usage of 'water'. Can water substitute proper coolant liquid?

Thankfully the coolant levels on my P2 is relatively stable and doesn't drop that much! I check it almost every 2-3 weeks cos phobia after my previous incidents with my older cars.

Yup, the older generation only know to use tap water. Cause the old school pomen all teach people to use tap water. The reason you need to top up constantly is because tap water will evaporate faster than coolant. As information become easier to access, we start to learn that tap water is not the correct thing to do. Coolant is the right thing to use. So it's a matter of time when using tap water is no longer common.

I see. No wonder!

So in a way, it was not 'wrong' to do back then cos it was probably lack of access to proper information...

Anyways, now almost all the modern cars are using proper coolant [the thick type] and not so watery as in the past...

Thanks a lot for the insight bro!