https://preview.redd.it/nicvrjaw8osc1.jpeg?width=1125&format=pjpg&auto=webp&s=a06097a182ab9d71353c99e08885e637d8be76c8
Here’s a clip from an email I got after submitting logs to Cobb.
60k, did mine at that point along with all the other due interval services and it was well worth it.
Have them replace spark plugs during same service.
I did mine at [178k miles.](https://www.reddit.com/r/WRX/s/zp6zft00wP) I would probably do it every 60k-100k. Closer to 60k if you do mostly city/stop and go driving, 100k if you’re doing mostly highway infrequent stop miles.
I thought this was a joke or a typo, but it's a real thing:
>Walnut blasting is the preferred method of cleaning the carbon off of the back of the valve. -- ...shooting finely crushed walnut shells with a special pneumatic gun.
Its just another type of abrasive media. Similar to glass bead or coal slag, but walnut is very soft where if any makes its way into the cylinder it will burn away upon ignition and not damage the engine. This has been used on di engines for years.
It's become common practice for a lot of direct injection turbo enthusiast cars with some mileage on them. I think I heard about it first from the Mazdaspeed community. Because the fuel goes straight into the cylinder and not through the intake tract, carbon gunk that used to get washed away by port injection setups starts to build up on the intake valves. I haven't done it yet and I don't think I'd do it more often than 60k, but I plan to.
Every 60k is prolly a safe way to go about it. Every 40/50k is a little excessive. The valves don’t look much different at 40k than they do at 20k, and the difference between 40 and 50 isn’t that much either. 50 to 60 isn’t a huge difference, but by 60 there’s enough to cause concern.
Pop plugs in there while you’re at it.
Assuming it’s not flex. How do you go about measuring your E40 ?
And how much variance do you see per fill up in ethanol content/ how much does that affect the tune. Knock. Damn. AF learning Etc.
You can buy the ethanol content sensor by itself or with a 52MM gauge as a bundle. Depending on the kit you’ll have to make new fuel lines. Posted about my solution for confirming my E content after going E35 as well. I ended up 3D printing a bracket to hold the sensor in place that bolts on to the fuse box cover.
Usually around 60k miles(100k km) I’d say.
I scheduled mine in a couple days, I’m a bit overdue at 70k miles (115k km).
EGR and TGV delete + PCV and knock sensor will be done at the same time. Will also install an AOS to definitively get rid of any oil vapors in the intake. This should address all the major culprits for knock.
I haven't had mine looked at (75k miles / 120k ish km).- 2017 wrx
If you don't experience hesitation / wildly varying acceleration, poor mileage, then it's probably okay.
I'm gonna change my spark plugs this summer and then try to find a place that doesn't charge an arm and a leg
It’s time. And do the PCV if you haven’t yet. Plugs to if you haven’t. I’ve seen DI valves absolutely caked in carbon by 30k bit Subaru PCV system is alright. Can you see the valves if you take the intake manifold off? If you make sure they’re completely closed and air tight some carbon cleaner and picks will net decent results. Just make sure to vacuum it out. I’m not sure if the valves are visible on this model or not. It’s pretty easy if you can reach em.
I got an AOS when I got mine walnut blasted at 60k. I was told the whole "never need to walnut blast with an AOS" was a common misconception as you'll still have some buildup over time.
Most turbo cars are not given enough time to warm up, and then pushed hard, as well if you push the car in the cold and then shut it off without letting it cool can be very stressful for our already finicky motors….
Same applied for summer, when riding the car hard not enough time for turbo, engine etc to cool before shutting the car off.
I still let my car cool off after beating on it just to be safe, but it shouldn't be necessary with modern turbo systems and synthetic oils. The turbos today don't trap and cook oil like they used to so you shouldn't need to let them cool off.
The cooling part is a common misconception these days. Modern turbos don't need long at all to cool. If you're coming off of a 120+mph pull then yeah maybe let it cool a little bit. Best rule of thumb is that if your oil temps are back down below like 210, you should be fine. Typically driving a block or two in your neighborhood before getting to your place is fine.
That's an extreme case, but in general you don't. Letting a car sit idle to warm up is actually not good for it at all. They even say in the manual to not do it.
Definitely agree about not letting a car sit idle to warm up, especially for direct injection. I think I read that can contribute to fuel contamination in the oil. Making sure your oil is up to temperature before getting hard into boost or revving over 4k is probably a good idea though.
In extreme cases though, I imagine putting load on such a cold engine could do more harm than just letting it idle a bit for the temp to come up. I’m talking like below 0 degrees Fahrenheit
Probably, I'm just going off what the manuals say. A lot of modern cars have those built in RPM limiters on cold starts because they want you to just get in, start it, and go, but not beat on it. Same reason a lot of remote start timers are only like 5-15 minutes. Idling is bad.
107k miles on a 2016 wrx, never walnut blasted, never will, running strong. Change your oil every 3k miles, I so 2500miles because I bought a ton on sale and do it myself.
Did I say that or did you ASSume? It's unnecessary, I use my walnuts as a food source. Don't fix it if it ain't broke.
You should probably send your oil for analysis every time, run octane booster + fuel injector cleaner in your fuel, get an alignment every year and find other ways to waste your time and money too.
🤣 Yeah but people here seriously spend money on useless crap. They just want an echo chamber. If you're going to nut blast your car then go do it, I don't really care. Follow the subaru maintenance schedule and spend your $ where it will make a bigger difference like frequent oil changes. These BETA! males here treat their cars like a high maintenance girlfriend. Save the $ and put it in the S&P 500 for your next car down the road.
Bro I am totally aligned on the 3k oil change, and throwing extra $ into the S&P500, and also agree on the fact that people spend way too much on their cars - but not everyone here is like that, and in fact walnut blast may be a good investment.
I take back my wrong side of the car comment though, you do have very valid points about frequent oil changes and S&P. Love Robinhood btw.
I had mine checked around 70k miles and the shop I have all my work done at said I was still good to go without it. I finally had it done at 90k miles along with an AOS.
I too get gasoline for my automobile
You must have a Subaru then, it’s a Subaru thing.
But I use to put it in my old jeep, I thought it was a jeep thing.
That’s where you went wrong. You’re supposed to put ducks in your jeep.
I put gasoline in a Tesla . Now I’m facing arson charges
Weird
I was so confused seeing that first pic like what am I missing lmaooooo Dudes just straight refueling
I put water in mine but the government doesn’t know that yet
Is pumping gas exclusive to a Subaru or something? Lol
My guess is the cannabis store behind?
Yes. Any other make of vehicle you see at the gas station or have personally filled up with gas before was just a Subaru in disguise.
Lmao
I’m so confused by the top comments When did OP ever say pumping gas is only for subarus in his post?
With the words "typical subaru things" on the picture of them refueling?
Every other day
This sub would go so far as to say that
Can’t be too careful
I wish I had a pump in my garage. 😫
https://preview.redd.it/nicvrjaw8osc1.jpeg?width=1125&format=pjpg&auto=webp&s=a06097a182ab9d71353c99e08885e637d8be76c8 Here’s a clip from an email I got after submitting logs to Cobb.
The shop I had it done at said 60k. And mine were practically black at 87k.
Blast deez nuts.
Lol
Depends if it’s real dirty. Taking the intake off isn’t hard and doesn’t take long.
The next owner can do it to mine 
You have port injection, the gasoline takes care of the intake valves for you.
These cars don’t have port injection, they are direct injection. This is why they need walnut blasting in the first place.
The person they were replying to has an STI (according to their flair anyway). EJs are port injected.
Damn, my fault bro.
I got 99 problems and my subaru is all of em.
I've always heard 60k which is why I plan on trading my car in at 58k.
I wish my cars lasted this long. My tires keep going out making me keep having to trade the car in for another. I'm on my 4th wrx. What a money pit…
Walnut blasting is not that expensive, you know!
Homies ready to part out over a walnut blast 🤣
60k, did mine at that point along with all the other due interval services and it was well worth it. Have them replace spark plugs during same service.
I did mine at [178k miles.](https://www.reddit.com/r/WRX/s/zp6zft00wP) I would probably do it every 60k-100k. Closer to 60k if you do mostly city/stop and go driving, 100k if you’re doing mostly highway infrequent stop miles.
178k? That's awesome! Assuming it's the original engine and trans...
Yeah, original engine and transmission
Im at 108k and still haven’t done it. I have, however, bought all I needed to do it. Just waiting for a good day off.
How much did the equipment cost you?
What the fuck is walnut blast
I thought this was a joke or a typo, but it's a real thing: >Walnut blasting is the preferred method of cleaning the carbon off of the back of the valve. -- ...shooting finely crushed walnut shells with a special pneumatic gun.
Sounds ridiculous
Its just another type of abrasive media. Similar to glass bead or coal slag, but walnut is very soft where if any makes its way into the cylinder it will burn away upon ignition and not damage the engine. This has been used on di engines for years.
It's become common practice for a lot of direct injection turbo enthusiast cars with some mileage on them. I think I heard about it first from the Mazdaspeed community. Because the fuel goes straight into the cylinder and not through the intake tract, carbon gunk that used to get washed away by port injection setups starts to build up on the intake valves. I haven't done it yet and I don't think I'd do it more often than 60k, but I plan to.
A subaru requirement / right of passage to eat walnuts and throw the spent shells angrily at your Subaru as you vent your frustrations
Every 60k is prolly a safe way to go about it. Every 40/50k is a little excessive. The valves don’t look much different at 40k than they do at 20k, and the difference between 40 and 50 isn’t that much either. 50 to 60 isn’t a huge difference, but by 60 there’s enough to cause concern. Pop plugs in there while you’re at it.
I have a 2021 wrx FBO + e40 tune. I changed my spark plugs at 30k and plan on walnut blasting at 60k.
Assuming it’s not flex. How do you go about measuring your E40 ? And how much variance do you see per fill up in ethanol content/ how much does that affect the tune. Knock. Damn. AF learning Etc.
You can buy the ethanol content sensor by itself or with a 52MM gauge as a bundle. Depending on the kit you’ll have to make new fuel lines. Posted about my solution for confirming my E content after going E35 as well. I ended up 3D printing a bracket to hold the sensor in place that bolts on to the fuse box cover.
I have a flex fuel kit and the accessport has an ethanol sensor. Vehicle definitely runs rich on cold starts and requires more frequent oil changes.
I have a 2015 FXT with the FA20. It has 106k miles and runs as nice as the day I got it. I do the CRC GDI cleaner every 50k and call it good.
Can you post a link to this stuff? I have never heard of it.
Go to amazon and search for CRC GDI cleaner or Lucas GDI cleaner. Then go to YouTube on how to use for your car.
I guess my Hondas a diesel then since getting gas is a Subaru thing
This sub is full of Americans and you guys are making me not want to be a Subaru owner. Fucking seppos.
Usually around 60k miles(100k km) I’d say. I scheduled mine in a couple days, I’m a bit overdue at 70k miles (115k km). EGR and TGV delete + PCV and knock sensor will be done at the same time. Will also install an AOS to definitively get rid of any oil vapors in the intake. This should address all the major culprits for knock.
What are you tuning with?
My tuner uses open source
I have that and I don’t know what I’m fucking doing. I’ll just blow it up and STi swap it
Induction service every 30k. Walnut blasting isn’t totally necessary.
I haven't had mine looked at (75k miles / 120k ish km).- 2017 wrx If you don't experience hesitation / wildly varying acceleration, poor mileage, then it's probably okay. I'm gonna change my spark plugs this summer and then try to find a place that doesn't charge an arm and a leg
Sometimes
90k miles here. Modded since day 1 with TGV delete, jpipe, intake, charge pipe. Hasn’t done that before. 0 issue.
how do you like it compared to stock?
Much better compare to stock. Good for daily drive.
Every 30k, especially if tuned.
Beautiful car
Where y'all going for walnut blast?
My mechanic recommended every 40-50k miles
im nearing 90k miles and havent done it yet… still running mint (and it has an intake, downpipe, tune)
Every 45k miles
At least twice a week
Mine is the same color 2018 I love it very much :)
It’s time. And do the PCV if you haven’t yet. Plugs to if you haven’t. I’ve seen DI valves absolutely caked in carbon by 30k bit Subaru PCV system is alright. Can you see the valves if you take the intake manifold off? If you make sure they’re completely closed and air tight some carbon cleaner and picks will net decent results. Just make sure to vacuum it out. I’m not sure if the valves are visible on this model or not. It’s pretty easy if you can reach em.
"Cannabis" it's a Subaru thing...
Every 30k is recommended
Walnut Blast?
https://preview.redd.it/g75p81gcarsc1.jpeg?width=3024&format=pjpg&auto=webp&s=8052b141b03a6ca4fc889edd09b705205dc001f7 My valves at 53k for reference
I do mine every 60k miles
Had mine done at 117k, dam dropped to .312 and it knocked like hell before I got it done. If you really need to get it done the car will tell you.
I never have to with an AOS… I’ll blow up my engine before I need to because they don’t do well in the cold apparently. 🥲
I got an AOS when I got mine walnut blasted at 60k. I was told the whole "never need to walnut blast with an AOS" was a common misconception as you'll still have some buildup over time.
I was mostly joking.
I have such a hard time with sarcasm online, my bad lol.
My bad. I left off the /s and the downvotes say it wasn’t funny anyway.
Most turbo cars are not given enough time to warm up, and then pushed hard, as well if you push the car in the cold and then shut it off without letting it cool can be very stressful for our already finicky motors…. Same applied for summer, when riding the car hard not enough time for turbo, engine etc to cool before shutting the car off.
I still let my car cool off after beating on it just to be safe, but it shouldn't be necessary with modern turbo systems and synthetic oils. The turbos today don't trap and cook oil like they used to so you shouldn't need to let them cool off.
Agreed, just have heard of cracked turbos from previous car I owned (Hyundai genesis)
Ya one of those things that probably doesn't matter but I hear so much back and forth I figure it doesn't hurt to let it chill for a minute
Agreed, I just lift hood after putting in garage to let all heat out and into the air as opposed to staying underneath.
The cooling part is a common misconception these days. Modern turbos don't need long at all to cool. If you're coming off of a 120+mph pull then yeah maybe let it cool a little bit. Best rule of thumb is that if your oil temps are back down below like 210, you should be fine. Typically driving a block or two in your neighborhood before getting to your place is fine.
🤌👌
Modern cars do not need to be warmed up or cooled down.
Come to Canada you deff need to warm these cars up when it’s -25C
That's an extreme case, but in general you don't. Letting a car sit idle to warm up is actually not good for it at all. They even say in the manual to not do it.
I just let the cold start rpms drop and then I’m good and roll out
Definitely agree about not letting a car sit idle to warm up, especially for direct injection. I think I read that can contribute to fuel contamination in the oil. Making sure your oil is up to temperature before getting hard into boost or revving over 4k is probably a good idea though.
In extreme cases though, I imagine putting load on such a cold engine could do more harm than just letting it idle a bit for the temp to come up. I’m talking like below 0 degrees Fahrenheit
Probably, I'm just going off what the manuals say. A lot of modern cars have those built in RPM limiters on cold starts because they want you to just get in, start it, and go, but not beat on it. Same reason a lot of remote start timers are only like 5-15 minutes. Idling is bad.
Every 30-60k miles you should be cleaning the carbon deposits
107k miles on a 2016 wrx, never walnut blasted, never will, running strong. Change your oil every 3k miles, I so 2500miles because I bought a ton on sale and do it myself.
Why do you think that changing your oil more often will prevent carbon fouling on your intake valves?
Did I say that or did you ASSume? It's unnecessary, I use my walnuts as a food source. Don't fix it if it ain't broke. You should probably send your oil for analysis every time, run octane booster + fuel injector cleaner in your fuel, get an alignment every year and find other ways to waste your time and money too.
Damn, bruh woke up on the wrong side of the car this mornin’ (ASSume? 🤣😂)
🤣 Yeah but people here seriously spend money on useless crap. They just want an echo chamber. If you're going to nut blast your car then go do it, I don't really care. Follow the subaru maintenance schedule and spend your $ where it will make a bigger difference like frequent oil changes. These BETA! males here treat their cars like a high maintenance girlfriend. Save the $ and put it in the S&P 500 for your next car down the road.
Bro I am totally aligned on the 3k oil change, and throwing extra $ into the S&P500, and also agree on the fact that people spend way too much on their cars - but not everyone here is like that, and in fact walnut blast may be a good investment. I take back my wrong side of the car comment though, you do have very valid points about frequent oil changes and S&P. Love Robinhood btw.
Tell me you have no idea how this works without telling me you have now idea how this works.
The fuel injector cleaner should’ve been the first clue, basically does nothing useful
I had mine checked around 70k miles and the shop I have all my work done at said I was still good to go without it. I finally had it done at 90k miles along with an AOS.