I will always take the owner's manual's advice before ANYTHING I read on this forum.
If the subject isn't covered in the owner's manual, then I'll read here with the salt shaker in hand.
Auto Stop/Start System ► feature discussion ONLY (merged thread)
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If the subject isn't covered in the owner's manual, then I'll read here with the salt shaker in hand.
My experience with service advisors is that they are just regurgitating something on their computer screen filtered down from head office.
And if it's not on their screen, they have no clue.
The last service advisor I talked to (4 years ago) suggested making an appointment to have the power windows "fixed" after my door panels were taken off for some work by an auto body shop.
I was at home on the phone with him.
After a 30 second Google on my part I found the solution myself how to do a power window reset.
No disrespect intended on my part, but your son is not the guy who wrote the owner's manual.
Engineering Explained has a good video on this, with numbers. Search previous posts here, or on his YouTube channel.
You have to return the energy to the battery, and the energy isn’t free, it uses fuel, and when you use that fuel, you generate emissions.
The person who wrote the manual was probably a tech writer. Often/usually the tech writers and service advisors are not mechanics or engineers, but office/admin staff or summer jobs etc.
Actually service advisors could be classified as sales, I think.
ALL, please consider this a warning about saying bad things about dealer and "Don't trust what you read on the internet". Everyone on here has bad experiences on both sides of the fence. So let's not continue this direction for this thread. 
Since I'm back at a computer now, here's the video:
In the test where two identical cars, except one has AS/S and one doesn't, drive the same route at the same time, and they measure the fuel consumption, what they should have done is have the headlights, wipers, defog, etc on, and measure the state of charge of each battery at the beginning and end of the test. If the car with AS/S has a battery with a deeper depth of discharge at the end of the test, it should continue to run until the state of charge of the battery matches the one in the car without AS/S, otherwise it's not a real test, because less fuel is used by the AS/S car, but it will have to recharge the battery and use fuel to do that.
Maybe not. But if all cars had stop/start it would make a significant difference to air quality around traffic light controlled intersections.
I agree and I try my best, but my brain simply can't let posts advising owners to replace their EFB with a non-EFB go unanswered. Owners need to know the possible consequences of that decision.ALL, please consider this a warning about saying bad things about dealer and "Don't trust what you read on the internet". Everyone on here has bad experiences on both sides of the fence. So let's not continue this direction for this thread.
@auntiesuebee,
I perused the '22 owner's manual, and there was NOTHING in it about any special battery recommendations.
I went to the NHTSA website, and looked for complaints registered for any Subaru vehicle for battery fires or electrical failures caused by replacing the OEM battery with a non-recommended replacement. NOTHING.
I Googled Subaru battery replacement for '19-'22 looking for warnings. NOTHING.
If your son works at a Subaru dealership, I would expect he would have access to a TSB or any warning from head office that this electrical danger/fire hazard exists.
So, I will assume your son 's dealership had a 1 off caused by who knows what.
But to make a blanket statement that non-OEM battery replacements will cause any Subaru with auto start/stop to have an electrical problem and/or fire is a knee-jerk unsubstantiated statement that is nothing more than sensationalism.
If you can link to ANY proof-substantiating evidence, I will certainly offer up a sincere apology.
I perused the '22 owner's manual, and there was NOTHING in it about any special battery recommendations.
I went to the NHTSA website, and looked for complaints registered for any Subaru vehicle for battery fires or electrical failures caused by replacing the OEM battery with a non-recommended replacement. NOTHING.
I Googled Subaru battery replacement for '19-'22 looking for warnings. NOTHING.
If your son works at a Subaru dealership, I would expect he would have access to a TSB or any warning from head office that this electrical danger/fire hazard exists.
So, I will assume your son 's dealership had a 1 off caused by who knows what.
But to make a blanket statement that non-OEM battery replacements will cause any Subaru with auto start/stop to have an electrical problem and/or fire is a knee-jerk unsubstantiated statement that is nothing more than sensationalism.
If you can link to ANY proof-substantiating evidence, I will certainly offer up a sincere apology.
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In relation to start/stop battery this may be worth a read: EFB or AGM – Which battery do I need?
Interesting read.
That article sends the message that an AGM battery is superior in performance to an EFB, regardless of application, for a vehicle with stop/start.
AGM's have been used for years as OEM for motorcycles.
The new generation Goldwing with a boxer 6 cylinder engine and 1833 cc has stop/start tech, and uses an AGM.
@bigbird1 (EFB) - Enhanced Flooded Battery. AGM (Absorbed Glass Matt). Key word with EFB is "Flooded" battery. Keyword for AGM is Absorbed.
AGM batteries can be flipped upside down and no acid will pour out. They can also be installed sideways/horizontally. They can also be installed inside the passenger compartment safely.
EFB are a step above regular flooded lead acid battery. They were designed as a small step above flooded acid battery to handle the Start/Stop systems and at the same time not cost the car makers too much money like the AGM battery.
Flooded batteries cannot be installed sideways, horizontally. Nor can they be installed in passenger compartments.
AGM batteries can be flipped upside down and no acid will pour out. They can also be installed sideways/horizontally. They can also be installed inside the passenger compartment safely.
EFB are a step above regular flooded lead acid battery. They were designed as a small step above flooded acid battery to handle the Start/Stop systems and at the same time not cost the car makers too much money like the AGM battery.
Flooded batteries cannot be installed sideways, horizontally. Nor can they be installed in passenger compartments.
I've been using AS/S on short trips 5 days a week minimum, for the past year/10,000 miles. It has adequate charge most mornings within 2 miles to the first stoplight to shut off the engine. If the battery wasn't sufficiently charged, or the engine warm enough, it would not activate.
There are a lot of times the voltage drops to 11.2 volts when driving. It has yet to show any signs of difficulty cranking over.
Most times it's running, and leaving the light well before the cars that never shut off. There is virtually no lag compared to a regular car.
Is it going to kill the battery?
Time will tell, but if it's so bad, it will be on Subaru, because reading online, it will be lucky to make it a few years with normal driving.
I have saved 5.5 hours idling time, and a bit over 2 gallons.
I doubt there's any additional wear on the engine. It's far from a cold start each time. The oil is hot and everything is covered.
Even on a cold start the oil light is out before it fires.
That's also over 5 hours it isn't building carbon on the intake valves. Nobody wants to talk about that though.
At idle is when the PCV usually pulls from the valve covers more than driving in a lower manifold vacuum situation.
Just thinking out loud here: Consider AS/S didn't come about en mass until GDI on Subaru, at least in the States. In addition to reducing emissions, reducing cabin buildup might have been a conveniently unmentioned feature of AS/S.
There are a lot of times the voltage drops to 11.2 volts when driving. It has yet to show any signs of difficulty cranking over.
Most times it's running, and leaving the light well before the cars that never shut off. There is virtually no lag compared to a regular car.
Is it going to kill the battery?
Time will tell, but if it's so bad, it will be on Subaru, because reading online, it will be lucky to make it a few years with normal driving.
I have saved 5.5 hours idling time, and a bit over 2 gallons.
I doubt there's any additional wear on the engine. It's far from a cold start each time. The oil is hot and everything is covered.
Even on a cold start the oil light is out before it fires.
That's also over 5 hours it isn't building carbon on the intake valves. Nobody wants to talk about that though.
At idle is when the PCV usually pulls from the valve covers more than driving in a lower manifold vacuum situation.
Just thinking out loud here: Consider AS/S didn't come about en mass until GDI on Subaru, at least in the States. In addition to reducing emissions, reducing cabin buildup might have been a conveniently unmentioned feature of AS/S.
From memory when cars had actual vacuum gauges, I believe max vacuum was produced when coasting down from higher rpm with the throttle plate fully closed, and idle vacuum wasn't far behind.
I agree that heavy start stop driving in hot weather would be the only benefit of any substance to an owner, in terms of reduced PCV fumes depositing on the back of the intake valves.
However, an oil vapour catch can would be an even better solution than start/stop IMHO, but a catch can would be breaking a law or two in some jurisdictions.
Any individual battery, AGM, EFB, etc. can be defective and cause problems.
And, I don’t doubt that a vehicle can exhibit problems with a defective battery, AGM, EFB or otherwise.
However, drawing the conclusion that a replacement AGM battery substituted for an EFB automatically will create unsafe issues is a bridge too far for me, especially since I’ve done exactly that in my 19 Touring, without any signs of problems. And, one can scan this forum and find an entire host of others that have had the same experience as I have had.
And, I don’t doubt that a vehicle can exhibit problems with a defective battery, AGM, EFB or otherwise.
However, drawing the conclusion that a replacement AGM battery substituted for an EFB automatically will create unsafe issues is a bridge too far for me, especially since I’ve done exactly that in my 19 Touring, without any signs of problems. And, one can scan this forum and find an entire host of others that have had the same experience as I have had.
If I keep the car beyond the warranty period I will have the extended warranty. If I keep my foot on the brake lightly it doesn't stop.
That's you're procedure which we are not talking about. We are talking about what everyone else does. Meaning not everyone buys extended warranty. many also want to keep there vehicles running on the road longer than extended warranty, you may not want to keep it beyond the extended warranty. In your earlier post you also state, you use it all the time. Sooooo.....which is it? Do you use the feature or do you roll-up to every single light and keep a light foot? Yes there are also add-ons for people that don't follow your procedure of light foot on brake......It just goes on and on and on.
The feature as many state, wears out batteries and starters. How soon will we know? We already see batteries being replaced every 2-3 years already from the factory. Worse for those of us that live in HOT states, 1-2 years is all we get from factory batteries.
Do we know how long the starters will last? 100,000 miles? 80,000 miles, etc...?
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