Author Topic: Honda Jazz 2015 GK CVT Transmission Oil Overfill?  (Read 2654 times)

Homith

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Honda Jazz 2015 GK CVT Transmission Oil Overfill?
« on: June 28, 2026, 12:55:27 AM »
Good morning, I have a Honda Jazz 2015 GK (Australia) and yesterday did my CVT transmission fluid change. Purchased 4 liters of Honda HCF-2 transmission fluid and replacement crush washers from the local Honda dealer and proceeded to get to work.

Watching a lot of YouTube videos and reading up as much as I could it seemed that the transmission would take 3.6 liters of fluid, so I was confident I had enough. Concerningly, I ended up adding the whole 4 liters before fluid would drain out of the fill check bolt hole.

These are the steps I took;
1. Drove the car for approx. 15mins to warm up the CVT and jacked and leveled the car
2. Cracked open the fill check bolt
3. Drained the oil from the drain bolt until the stream of oil stopped 
4. Cleaned and replaced the drain bolt and torqued
5. Removed the fill check bolt
6. Using a funnel with hose attached, inserted the tube into the check bolt hole and filled until transmission fluid (HCF-2 - purchased a 4-liter (4.23 quarts) bottle) poured out of the check bolt hole. Took approx. 3.5 liters (3.7 quarts).
7. Replaced the fill check bolt & loosely tighten
8. Start the car and cycle through all gear selections leaving them in the selection for at least 10 seconds (repeated this twice)
9. Removed the check bolt again and inserted the funnel and hose.
10. Proceeded to fill until the transmission oil again poured out of the check bolt hole - HOWEVER!! it took the rest of the oil in the bottle before it started pouring out.
11. Refitted the fill plug with new crush washer and torqued

What have I done wrong?? I measured the oil in the drip pan where the overflow and old oil was collected in and it measured 4.4 liters. So confused right now. Torqued up the check bolt and needed to drive it - Keen to know what I have missed.

Keen to understand if I should just leave it or should I drain and replace again with new fluid. I have opened the fill check bolt again after driving for approximately 15 more minutes and no more fluid has come out.

Thanks in advance for listening and welcome any advice.

Marco1979

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Re: Honda Jazz 2015 GK CVT Transmission Oil Overfill?
« Reply #1 on: June 28, 2026, 06:11:46 AM »
Seems you did everything correct. Maybe the car was not entirely level, so more oil was drained than usual and as a result you needed to add more.
I found some info on fitfreak.net and it seems anything from 3.5 to a little over 4 liters could be needed.
In case your car was not level when checking for overflow, I would be tempted to repeat that check.

Lord Voltermore

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Re: Honda Jazz 2015 GK CVT Transmission Oil Overfill?
« Reply #2 on: June 28, 2026, 09:24:48 AM »
I've never done this particular job but could the following be  a factor? - 

step 1 involves  driving 15 minutes to warm the oil.  The  warm, thin,  oil will drain out more quickly.
 
step 8  involves running the car for a short  period measured in seconds.    The  new  oil will be circulated  into the far reaches of the gearbox and coat  moving parts.  But will still be cold and a relatively thick viscosity. Maybe you are checking the check hole  a bit too soon.

It seems logical to me that there may be up to half a litre of oil still coating upper areas that may take a little longer to fully  drain down .

Personally I would would thoroughly warm the car up,  wait long enough for the oil to drain down  and then check the level plug again to see if any excess comes out.   But the car will need to be absolutely level, ideally on a car lift or over a pit.  It will be more difficult to be accurate enough  using axle stands etc.
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