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decarbonization

Model Years 2024 and Newer
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2024 crosstrek wilderness decarbonization direct injected engine engine service intervals
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#21 ·
kr_xv said:
The protocol is the same with decarbonization through intake cleaner, I believe is just a matter of different chemical that they run inside there. For liquimoly, this process consists of 2 parts, run through intake and put another one(different product#) in the gas tank.
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I’m so confused man. I don’t think this is a thing
 
#22 ·
kr_xv said:
The protocol is the same with decarbonization through intake cleaner, I believe is just a matter of different chemical that they run inside there. For liquimoly, this process consists of 2 parts, run through intake and put another one(different product#) in the gas tank.
Click to expand...
ok ok, so they call it catalytic cleaner but in reality it's an intake/valves cleaner. So you keep the combustion chamber clean and your catalytic converter doesn't receive debris and doesn't get clog

www.liqui-moly.com

Catalytic-System Cleaner

Protects the catalytic converter from clogging with soot. Cleans intake valves and the combustion chamber. Improves the combustion of the fuel. Clean engines reduce fuel consumption and therefore CO2 emissions. Prevents corrosion in the fuel system.
www.liqui-moly.com www.liqui-moly.com

in my opinion it's just another product that "cleans" the intake but with a different name.....
 
#23 · (Edited)
Somewhere in my Subaru service travels I found "Your Severe Maintenace Schedule: 2024 Subaru Crosstrek Wilderness" which is for 300k miles.
It never says "decarbonize" anything. Change the engine oil and filter and engine air cleaner often.
If Subaru doesn't say to do it, it isn't going to happen. I have the 80k mile extended Service Plan, only going to do what it says, nothing more, nothing less.
Not going to give them the chance to deny coverage because I did or didn't do something.
I also have pages 28 and 29 out of the "WARRANTY & MAINTENANCE 2024" booklet that came with my Subaru. Doesn't say anything about decarbonizing anything.
Page 43 of the "Getting Started Guide Crosstrek 2024" has the "FUEL SPECIFICATIONS AND CAPACITY". Doesn't say anything about using "Top Tier" fuel, but that is what we get in the State I live in.
 
#24 ·
Subaru does sell their own intake cleaner, so it’s not like they don’t recommend the procedure.

SOA868V9160 - Top Engine Cleaner - Genuine Subaru Part

Genuine Subaru Part # SOA868V9160 - Top Engine Cleaner
parts.subaru.com

The question is whether you want to do it proactively as part of regular maintenance, or wait until the buildup is so bad you have drivability issues.
 
#25 ·
AM407 said:
You are correct that fuel doesn’t contact the top of the intake valves. That’s the whole problem with DI.

But a cleaner would be piped in through the intake, so yes it would contact the back of the valves and possibly be of some benefit.
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Run the cleaner through a vacuum line.
 
#26 ·
I have 335k miles on my fuel injected Oldsmobile 3800 Series II engine. It is my daily driver. Original fuel injectors and throttle body. Never used any kind of cleaner. Still runs good.
If my Subaru throws a CEL code I will let my Warranty or Extended Warranty deal with it.
Have a bad feeling it is going to cost me a lot of money just to do the prescribed severe service maintenance mandated by Subaru. I am pretty sure they are going to call driving off road Severe Service.
If my Service Advisor wants to do it for gratis, that is fine.
 
#27 ·
Maybe I'm "old school" but this sounds like a scam. I was always taught to take the car out on the freeway for a good burn. If you're making a lot of stop & go drives and for short distances it's always good to take her out at high speeds for a bit to burn off the carbon buildup.
Is that not the case any more?🙄
 
#28 ·
Kjzoe123 said:
Maybe I'm "old school" but this sounds like a scam. I was always taught to take the car out on the freeway for a good burn. If you're making a lot of stop & go drives and for short distances it's always good to take her out at high speeds for a bit to burn off the carbon buildup.
Is that not the case any more?🙄
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Nope! Older cars did benefit from the ol ‘Italian tuneup’ but it’s not that way anymore
 
#29 ·
sanghill said:
I have 335k miles on my fuel injected Oldsmobile 3800 Series II engine. It is my daily driver. Original fuel injectors and throttle body. Never used any kind of cleaner. Still runs good.
If my Subaru throws a CEL code I will let my Warranty or Extended Warranty deal with it.
Have a bad feeling it is going to cost me a lot of money just to do the prescribed severe service maintenance mandated by Subaru. I am pretty sure they are going to call driving off road Severe Service.
If my Service Advisor wants to do it for gratis, that is fine.
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Your Olds 3800 is not Direct Injection. Modern DI engines are a completely different kettle of fish.

Kjzoe123 said:
Maybe I'm "old school" but this sounds like a scam. I was always taught to take the car out on the freeway for a good burn. If you're making a lot of stop & go drives and for short distances it's always good to take her out at high speeds for a bit to burn off the carbon buildup.
Is that not the case any more?🙄
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Nope. Direct Injection has changed all that.
 
#30 · (Edited)
Did not know. Another 21st Century "advancement". Like I need ESS to tell me when I need to turn the engine OFF to save gas. I know which lights are "forever".
I want to "drive" my Wilderness, Don't want it "driving" me.
Somehow I never got into the 21st Century.
Now that I am out of "break-in" I regularly hit 4k RPM going up steep hills on the Interstate. That and Top Tier gas should keep the intake system really clean.
End of rant.
 
#31 · (Edited)
sanghill said:
Did not know. Another 21st Century "advancement". Like I need *** to tell me when I need to turn the engine OFF to save gas. I know which lights are "forever".
I want to "drive" my Wilderness, Don't want it "driving" me.
Somehow I never got into the 21st Century.
Now that I am out of "break-in" I regularly hit 4k RPM going up steep hills on the Interstate. That and Top Tier gas should keep the intake system really clean.
End of rant.
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Unfortunately, direct injection has one indirect problem; exhaust gas recirculation/combustion blowby gases are fed back into the intake air manifold where it collects onto the interior passageways and intake valves. Injectors outside cylinders helped minimize buildup by spraying fuel in front of intake valves to help wash away the effects of egr. Direct injection places injectors next to spark plugs, spraying fuel directly into cylinders, allowing egr deposits to buildup on intake valves. Subaru downplays this phenomenon with zero mention in owner's manuals but willingly offer valve cleaning services for a fee. The two links I posted in a previous reply can help explain and show the effects of direct injection. DI in and of itself is another step in emissions control as well as fuel economy. However, the dark side of DI has been exposed. There are always compromises when technology advances. This is one of them.
 
#33 ·
That must be the reason for Top Tier gasoline. Guess I need to avoid my cash only el cheapo gas station.
I depend on Forums like this for a "reality check". Try to keep me straight, it is a tough job but somebody needs to do it.
 
#38 ·
Kjzoe123 said:
Yup Chevron stations have the techron added to their fuel to help clean the valves.
Btw... that was a pretty good rant.🤣
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Chevron gas had Techron decades before DI was a thing.

And you guys are still completely missing the point. Nothing you add to the fuel is going to do a damn thing to clean deposits off the top side of the intake valves.
 
#40 ·
Silver Fox24 said:
:unsure: what is it?
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Waiting till your engine, oil, and butt are all warm, and then redlining the crap out of them on curvy coastal roads while singing romantic slows to a mesmerized Italian top-model.

Jokes aside, "italian tune-up" does mean pushing the engine to its limits for a while. Allegedly to "burn the crap" out of it.
 
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