IW STi Forum banner
1 - 20 of 22 Posts

· Registered
Joined
·
96 Posts
Discussion Starter · #1 ·
My new 21 sti 14k miles on clock. coolant keep go down since day one I picked up the car new. Is it normal? If I drive a lot, need top up every1-2 months. No leaking checked past 5 oil change.
 

· Registered
Joined
·
96 Posts
Discussion Starter · #3 ·
How much have you added in total?
I got 1 gallon OEM coolant from dealer last year around October. Got car in May. only uses 1/4 so far. I only top the reservoir when it’s drop close to low and top it to close to full when engine is cold. I daily it from this end of July so far I topped once, I checked to day it needs to be top again soon. Before this July I only put 600+ miles per month it didn’t drop much. I drive normally. Barely build boost.
 

· Registered
Joined
·
3,034 Posts
Dealer and Subaru specialist shop all said there is no leak and said is normal. I mentioned on my third fourth and fifth oil change by different places
When are you adjusting the coolant level? I would recommend adjusting the coolant level first thing in the morning on a cold engine before you start it up. Make sure the car is also on level ground.

So in between oil changes, how much coolant or how often do you have to fill the tank?
 

· Registered
Joined
·
96 Posts
Discussion Starter · #8 ·
When are you adjusting the coolant level? I would recommend adjusting the coolant level first thing in the morning on a cold engine before you start it up. Make sure the car is also on level ground.

So in between oil changes, how much coolant or how often do you have to fill the tank?
I checked in the morning when it’s cold. Just couple oz from almost low to the reservoir is close to full
 

· Registered
Joined
·
96 Posts
Discussion Starter · #15 ·
Odd. Clearly it's going somewhere. You can try dye to track it down. Let it sit for a few days and then check. In my experience it takes some time for the fluid to move around and 'settle'.
My next oil change coming up next month, I’ll top up tmr and make notes take picture to see until next month oil change time. And tell the dealer or shop again what’s going on.
 

· Registered
Joined
·
17 Posts
My 2015 has been like this since I got it at around 8800 miles. Dealer told me the same thing and I even pressure tested it myself to see if I could find or hear it hissing out anywhere. Still couldn't find a leak. I only have to top mine off every 5-6 months. It's never gotten any worst and I'm at 92K miles. I'd just keep an eye on it and check it as often as you feel comfortable.
 

· Premium Member
See about
Joined
·
6,591 Posts
If it is filled too high, it will overflow and be lower than it was. You never need to top off a few ozs. So, let it go and see if it goes lower or even near dry.

Also check it hot! It doesn't matter what scale of full it is cold. But if it is topped off hot, than that's all you can fit . . . You can let it cool and try again. It the red were low, it will suck some into it. But after that full when hot is full - cause if you add more it will end up on the ground in time.
 
  • Like
Reactions: hhhydeee

· Registered
Joined
·
17 Posts
I've checked it both hot and cold. I only top it off when it reaches the low marker on the coolant reservoir.
If it is filled too high, it will overflow and be lower than it was.
The times I did overfill, it never overflowed and went lower than it was. At least not that I ever noticed. It seems to be a consistent decrease of fluid.
 

· Registered
2021 WRX STI
Joined
·
209 Posts
With it being pretty new I'd let it get kinda low and take to the dealer. I think this will sort of be like complaining about oil consumption while you keep it topped off. I also keep oil completely topped off, but the dealer isn't going to acknowledge it if you always bring it in at full and then tell them you have to fill it a lot. They always do the "oil consumption test". Silly, but it's the game you have to play to get issues acknowledged. You have to "show" them the problem. Obv don't let the car overheat, but I wouldn't hesitate to let it get pretty low and drive it in and say "hey, is this normal?". I'd also mark it at full in the overflow or take a picture and then do the same the day you take it in for records. That way if they go "ohh yea, sometimes we have to add some" you can say "really? after x months? Do you mind putting that info on the service ticket?". Tune may change when they realize they are basically documenting a get out of jail free card if your car ever overheats.
 
1 - 20 of 22 Posts
Top