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#4555615 - 10/26/17 08:51 PM What's the effect of idling a car on oil?
FermeLaPorte Offline


Registered: 07/25/17
Posts: 472
Loc: Texas (south)
How does idling a car, let's say an inline 4, affect oil life?
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#4555622 - 10/26/17 08:56 PM Re: What's the effect of idling a car on oil? [Re: FermeLaPorte]
jj51702 Offline


Registered: 10/07/16
Posts: 232
Loc: California
Ask all the 4 cylinder ford escapes and Prius vehicles in New York working as taxis and idling all day

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#4555623 - 10/26/17 08:57 PM Re: What's the effect of idling a car on oil? [Re: FermeLaPorte]
Rand Offline


Registered: 08/20/03
Posts: 12651
Loc: NE,Ohio
All engines are different.. but a generic rule would be.

1 hour of idling is about the same as driving 25 miles.

so 100 hours of idling = 2500 miles.

according to ford anyway.. but it seems reasonable.
https://www.fleet.ford.com/truckbbas/non-html/DeiselTips/DLSIDLETIMESS.pdf
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#4555653 - 10/26/17 09:19 PM Re: What's the effect of idling a car on oil? [Re: Rand]
Merkava_4 Offline


Registered: 01/30/07
Posts: 17501
Loc: Clovis, CA
Originally Posted By: Rand
1 hour of idling is about the same as driving 25 miles.


Are you saying the fuel usage is the same ?

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#4555663 - 10/26/17 09:30 PM Re: What's the effect of idling a car on oil? [Re: Merkava_4]
AVB Offline


Registered: 05/20/12
Posts: 1283
Loc: Georgia
Originally Posted By: Merkava_4
Originally Posted By: Rand
1 hour of idling is about the same as driving 25 miles.


Are you saying the fuel usage is the same ?
The linked flyer states the effect on the oil is the same, it doesn't mention fuel consumption or what speed those 25 miles were driven. In this example they are mostly talking about the high pressure oil pump's effect on the oil.

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#4555676 - 10/26/17 09:44 PM Re: What's the effect of idling a car on oil? [Re: FermeLaPorte]
Reddy45 Offline


Registered: 08/15/08
Posts: 2973
Loc: USA
Isn't fuel dilution a problem when you idle a lot?

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#4555745 - 10/26/17 10:48 PM Re: What's the effect of idling a car on oil? [Re: FermeLaPorte]
Linctex Offline


Registered: 12/31/16
Posts: 6148
Loc: Waco, TX
Idling a gasoline engines is typically no big deal, especially the newer EFI vehicles.

Diesel engines are another matter altogether - you'll kill a big Cat or Cummmins from too much idle time. The newer "emissions control" diesel engines will cost you HUGE $$$$ from too much idle time.
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#4555794 - 10/26/17 11:47 PM Re: What's the effect of idling a car on oil? [Re: FermeLaPorte]
CKN Offline


Registered: 10/14/14
Posts: 3700
Loc: Utah
On the newer cars the OLM can account for periods of long idling.

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#4555804 - 10/26/17 11:57 PM Re: What's the effect of idling a car on oil? [Re: FermeLaPorte]
Johnny2Bad Offline


Registered: 05/20/13
Posts: 1810
Loc: Saskatchewan, Canada
Idling (or "excessive idling" which is really the problem, not idling in the normal course of stop-and-go traffic or startup) is going to have a much greater effect on the wear components of the engine itself, regardless of the oil used, and relatively little effect on the oil itself, assuming a reasonable Oil Change Interval (OCI).

Not sure about the diesel idling thing; having worked in the far north where no diesel motor is shut down 24/7 unless it has heated indoor storage (and there isn't enough of that to go around) so spending 12 hours idling overnight is a normal operating condition unless operated over two 12-hour shifts. Same with half to one ton pickups ... nobody shuts them down and they are inevitably diesels, no gas motor light trucks.

Reason is simple, if you shut it down, two hours later (can be less, if wind cools the vehicle) it will never start with out aids (running a flex pipe from the exhaust of another running diesel to the engine compartment, then covering with a tarp for an hour or so is the usual method). Boost (or "Jump") starting isn't going to be enough by itself on a cold motor. Yes, it's cold, below -45F, I've seen it at -52F.

In any case, many of these trucks and heavy equipment run long hours or miles, as good as any warm-weather example. I see no evidence there is a detriment to the additional idling.
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#4555830 - 10/27/17 01:34 AM Re: What's the effect of idling a car on oil? [Re: Johnny2Bad]
chrisri Offline


Registered: 06/01/14
Posts: 1744
Loc: Rijeka, EU
Dad told me that years back ( late seventies, early eighties) before Webasto they would idle all night long for heating the sleep cabin. Even today some trucks don't have stand alone air conditioner so on that he would leave truck working for the whole weekend (south of Italy and Spain is terrible during summer).
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#4555838 - 10/27/17 01:49 AM Re: What's the effect of idling a car on oil? [Re: FermeLaPorte]
bubbatime Offline


Registered: 03/18/08
Posts: 5627
Loc: South Florida
My daily driver is getting WAY more idle time than I prefer. The parent pick up line at school adds 30-45 minutes of idle time every single day.

I changed from dino to synthetic for piece of mind, although I doubt it matters.
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#4555876 - 10/27/17 05:16 AM Re: What's the effect of idling a car on oil? [Re: FermeLaPorte]
Matagonka Offline


Registered: 02/03/15
Posts: 469
Loc: NC
It's not that bad. Think of all the idling you do at traffic lights.

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#4555899 - 10/27/17 05:47 AM Re: What's the effect of idling a car on oil? [Re: FermeLaPorte]
LoneRanger Offline


Registered: 07/02/07
Posts: 4060
Loc: Midwest USA
Check fleet operations for police. That's where you'll find passenger car engines idling the most for extended periods. Taxi's I would think would be shutting 'er down more often since the fuel is often on the driver's dime (independent contractors).
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#4555963 - 10/27/17 07:27 AM Re: What's the effect of idling a car on oil? [Re: FermeLaPorte]
ShotGun429 Offline


Registered: 12/09/04
Posts: 426
Loc: Dayton,Ohio
My daily driver, a ex police Crown Vic, has 8000 plus idle hours on it PLUS 100,000 miles and it seems no worse for the wear, runs great. Ford Fleet manual says every idle hour is equal to 33 road miles.

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#4556105 - 10/27/17 10:09 AM Re: What's the effect of idling a car on oil? [Re: FermeLaPorte]
Jeffs2006EvoIX Offline


Registered: 02/28/10
Posts: 1623
Loc: Imperial Valley, California
I have read but not confirmed that in Direct Injected Engines idling for "excessive" periods of time may contribute to quicker accumulation of deposits on the intake valves.

I just cant pin point where I read that. It makes sense though.

Look at a generator for example. They are gas powered, and diesel and they run all day. So if you do this, I would switch to your vehicles "severe" usage service interval for Engine oil.

Just my ten cents..


Jeff
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