Car Questions

Notifications
Clear all

[Solved] Why is it said that Start/Stop Systems wear out the engine?

Page 1 / 3
   RSS

1
Topic starter

Why do people say start/stop systems are bad for your engine? As Scotty says, newer cars have synthetic, low density oils allowing the oil to pump up to the engine very quickly. I'm addition, the engine is only turning off for a few minutes and remains hot. Therefore, the oil isn't completely draining out. Given all this, why is start/stop so tabooed? Is it just a myth that people believe to be true? 

62 Answers
3

7

Yes

4

The start/stop system doesn't necessarily wear out the engine faster because it's not a cold start as you mentioned. It wears out the starter faster lol! I turned my start/stop system off for my BMW as soon as I bought it. It's not worth turning your engine on and off at every stop to save a few cents on gas. Would you rather save a few cents on gas and spend a few thousand dollars on replacing the starter, or would you save a few thousand dollars and spend a few extra cents on not saving gas at a red light? Just my opinion...

Right. Other than wear and tear in the starter, I don't see how the engine will wear out when you're starting the engine at operating temperature with oil still sitting in the engine head.

May a ask what it takes to turn of the start stop? Is it like a flip of a switch? Or is it a little more involved?

@kaizen
It honestly depends on the vehicle. For BMW, there is a dedicated button for it above the engine start/stop button. So when you press it, it will turn off the feature and it will also remember the setting the next time you turn on the engine (you don't have to keep pressing it). As for other cars, I've heard that some don't have a dedicated button for it, so some re-coding needs to be done to turn it off completely. I've also heard that the dealer will not allow you to turn it off apparently...they have the software to do it, but they say it will void warranty of some sort (don't know why it would though). But most of the time this feature is enabled when you use some sort of "eco mode". So if there is an "eco mode" button for your car, perhaps turning it off will also turn off the auto start/stop feature. The eco mode on my BMW will force me to use the auto start/stop no matter what.

4

Auto stop start tech is crap. No, the 2.3 ecoooops is not a reliable 15-20 yr motor. It’s GDI, turbo, very small, auto stop start. (Which can be turned off). Put all those together it’s an absolute disaster. BUT Ford is backed into a corner between the Government and EPA, the engineers are just trying to meet the demands while trying to keep customers happy. and I promise you more companies will follow this trend soon enough. Small, GDI, turbo motors is where the American vehicle market is headed. Soon it will be the only thing you can buy with the exception of hybrid/ all electric. 

4

Yes, it is harmful.

Search this forum for more details. 

4

I think so and always turn it off.

4

Yes.

3

No matter what you have, most of the wear and tear of the engines happen when you start the car. The other thing is to wait couple of years and see how long do all these cars with Auto start/stop last, which to me is a gamble. 

3

No, especially if over those 15-20 years you plan to put 13,000-14,000 miles a year (per AAA) which comes out to 195,000-280,000 miles.  Smaller displacement turbo GDI engines with start-stop (especially Ford’s) will generally wear out before then, especially if you have a lead foot.

3

That "feature" is not for your benefit, it's to help meet gas mileage requirements. All the manufacturer cares about is that your engine makes it through the warranty period. What happens after that is not even a blip on their radar.

2

I've often wondered what the statistics say. The system is quite common nowadays.

2

First, I'm sorry you bought a Chrysler.  Second, the auto start/stop feature was thought up by some stoner who thought it would save fuel and make the EPA happy.  It is the single dumbest feature on motor vehicles.  Either buy a couple of stater motors and have them in your garage as spares, use the button to shut this feature off when you start your car, or go online and get an  auto start/stop eliminator that plugs into you OBD port.  

2

I hate those systems and would deactivate it if I could. According to Scotty it doesn’t improve your mpg very much and it wears out the starter considerably quicker. 

2

That won't last, both the start stop and the ecoboost are not known for longevity and you are combining the two which is a recipe for disaster.

2

Don't think you need another opinion, but yes, it is.  I have purposely avoided vehicles that feature such.  It's also incredibly annoying.

2

I hope by doing that you didn't mess up something else.

What is the correct name of this sensor and where is it on the vehicle?

2

Turn it off. It will cause more wear and tear on the car ( especially the engine). 

2

Not only the starter. The engine wears out faster too.

1

They will wear out engines faster due to the increased stop/start cycles & will certainly prematurely wear out your starter. 

1

And more more thing: I’m just curious how much you save on gas with that feature. 

@yaser @mountainmanjoe
Americans have no idea about a lot of things these days. Pretty interesting outcome though.

1

General engineering principles dictate a steady state will cause the least wear, assuming steady state is being operated within designed range (rpm, load, etc).  On my chevy truck I turn it off at train crossings... it's simply a judgement call and likely gives more piece of mind (and/or marketing) than anything irl.

I heard from studies that after 10 15 seconds of idling at a stop, it is more benifical for fuel economy to shut the engine off.

Yea, very vehicle/situation dependent. I tend to do it when I think it's gonna exceed a a couple minutes...hence the trains pretty much the only time I do it. Again, if it is giving (false?) peace of mind, there's still value to that.

1

It certainly has the potential to prematurely wear out the engine & engine accessories sooner due to the repeated start & shutdown cycles. 

The tiny amount of fuel saved is not worth the long term engine damage, in my opinion. 

1

That start/stop tech is just another thing to get you in the shop faster so you have to spend more money to fix what’s already a poorly made vehicle. You should have the option from the dash if you want to turn it off. I know some vehicles come with that option. 

1

Your best bet is to turn it off and forget about it.

1

Scotty says yes and yes

1

Start/Stop systems cause additional wear to various parts of the vehicle, including the engine and starter. It was never a good idea.

1

Yes, leave it OFF, minimal benefit if anything at all.....

1

Those systems are quite stupid. My Fusion has that auto-stop, and it turns off the climate control, power steering, and delays my takeoff, not to mention it causes unneeded wear. I turn it off.

1

1mpg is not very much. How much money would that save you per year?

Page 1 / 3
Share: