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#4722906 - 04/10/18 04:51 PM Oil light comes on at idle after warmed up.
atikovi Offline


Registered: 04/27/10
Posts: 253
Loc: Suburban Washington DC
Got a 2014 Dodge Dart 1.4L with 110,000 miles. Once it's warmed up the oil light comes on while waiting at a traffic light. If I rev it to 1,000 or 1,200 rpm it goes out. Also hear some engine noise or maybe slight knock when warm that isn't there when cold. Doesn't smoke. Thinking of options before getting a junkyard engine. The oil looks brand new so somebody thought a change might help, just don't know what they used. How about trying 20W50 or even thicker single weights?

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#4722909 - 04/10/18 04:54 PM Re: Oil light comes on at idle after warmed up. [Re: atikovi]
SHOZ Offline


Registered: 06/28/03
Posts: 5802
Loc: Illinois
What weight oil are you using now? A bad rod bearing will have a slight knock when cruising and idle but it will disappear when coasting.
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#4722912 - 04/10/18 04:58 PM Re: Oil light comes on at idle after warmed up. [Re: atikovi]
Eddie Offline


Registered: 12/07/03
Posts: 9649
Loc: Florida, Cape Coral
You might want to replace the oil pressure sensor or have the pressure checked with a gauge.
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#4722913 - 04/10/18 04:59 PM Re: Oil light comes on at idle after warmed up. [Re: Eddie]
Donald Offline


Registered: 03/21/04
Posts: 20548
Loc: Upstate NY
Originally Posted By: Eddie
You might want to replace the oil pressure sensor or have the pressure checked with a gauge.


This.
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#4722918 - 04/10/18 05:09 PM Re: Oil light comes on at idle after warmed up. [Re: atikovi]
atikovi Offline


Registered: 04/27/10
Posts: 253
Loc: Suburban Washington DC
Don't know what weight was used as I just picked it up. I will check with a gauge.

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#4722920 - 04/10/18 05:13 PM Re: Oil light comes on at idle after warmed up. [Re: atikovi]
BrocLuno Offline


Registered: 09/06/15
Posts: 5613
Loc: Kalifornia Kollective
If you hear a noise, it's prolly a rod bearing ... That does not mean a new engine, it just means it's worn.

IF they ran it out of oil sometime in the past, the journal will be scored and it will get bad rather quickly. If it stays the same over a period of weeks or month, it's just worn.

The pressure sender for the light is prolly a 10 PSI sender. I-H used to have 5 PSI senders, so go to a NAPA store and see if they can cross reference one that will fit your thread and space requirements ... Install and be done with the light.

About oil, I'd prolly go to Delvac or Delo 400 15W-40 and see what that does before jumping right to 20W-50 ... They are stout and have better HTHS than some 20W-50's so may serve better for say a 5,000 OCI smile
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#4722923 - 04/10/18 05:21 PM Re: Oil light comes on at idle after warmed up. [Re: atikovi]
gathermewool Offline


Registered: 01/09/09
Posts: 6050
Dipstick indicates full of oil?

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#4722930 - 04/10/18 05:35 PM Re: Oil light comes on at idle after warmed up. [Re: atikovi]
atikovi Offline


Registered: 04/27/10
Posts: 253
Loc: Suburban Washington DC
But of course.

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#4722933 - 04/10/18 05:46 PM Re: Oil light comes on at idle after warmed up. [Re: atikovi]
JimPghPA Offline


Registered: 08/22/09
Posts: 3859
Loc: Pittsburgh,PA U.S.A.
To the original poster. You are describing the symptoms of an oil-pump going bad.

A thicker oil like 20W-50 might enable it to maintain enough pressure once it is warmed up, or it might not. Even if a thicker oil does enable it to maintain enough oil pressure the oil-pump will eventually become so bad that it will not be able to keep the pressure high enough even with a thicker oil.
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#4722934 - 04/10/18 05:47 PM Re: Oil light comes on at idle after warmed up. [Re: atikovi]
PimTac Offline


Registered: 03/04/17
Posts: 4591
Loc: Soviet State of Washington
I would get that oil changed out first thing since you really don’t know what’s in there. BrocLuno’s suggestions for oil are good.
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Valvoline Advanced Synthetic 0w20
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#4722948 - 04/10/18 06:09 PM Re: Oil light comes on at idle after warmed up. [Re: atikovi]
FlyNavyP3 Offline


Registered: 07/04/16
Posts: 1426
Loc: Jacksonville, FL
Originally Posted By: atikovi
Don't know what weight was used as I just picked it up. I will check with a gauge.


If you just bought it and it has low/no oil pressure at idle why not just bring it back and get something else?

Assuming it's not a bad sender. Thicker oil, lower psi sender, Lucas or STP are all band aids for an injured engine.

Not to say it can't last a long time that way. In high school a friend and I limped his daily driver 360 FE Ford in a 1976 F150 for over a year and a half with 0 idle oil pressure and only about 15 psi at 3500-4000 RPM. It lived on a 50/50 mix of either Lucas or STP and Napa 20w50 until we replaced it with a rebuilt engine that we built on evenings and weekends as cash allowed.
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#4722958 - 04/10/18 06:19 PM Re: Oil light comes on at idle after warmed up. [Re: PimTac]
philipp10 Offline


Registered: 05/09/14
Posts: 1186
Loc: Minnesota
Originally Posted By: PimTac
I would get that oil changed out first thing since you really don’t know what’s in there. BrocLuno’s suggestions for oil are good.


Check the oil pressure with a guage. No matter what oil is in there is immaterial if you don't have enough pressure. "Hope in a can" is not an option.

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#4722970 - 04/10/18 06:29 PM Re: Oil light comes on at idle after warmed up. [Re: atikovi]
Gokhan Online   content


Registered: 12/29/10
Posts: 3062
Loc: Los Angeles, California
I once had the same thing because the oil-pressure sensor was leaking at the threads.
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1985 Toyota Corolla LE, 4A-LC engine, ~ 270,000 M
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Mobil 1 EP M1-103 filter, 90430-12031 drain gasket

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#4722971 - 04/10/18 06:30 PM Re: Oil light comes on at idle after warmed up. [Re: philipp10]
atikovi Offline


Registered: 04/27/10
Posts: 253
Loc: Suburban Washington DC
Originally Posted By: philipp10
Originally Posted By: PimTac
I would get that oil changed out first thing since you really don’t know what’s in there. BrocLuno’s suggestions for oil are good.


Check the oil pressure with a guage. No matter what oil is in there is immaterial if you don't have enough pressure. "Hope in a can" is not an option.


Yes agree, but if the pressure is ok when cold and the oil is thicker, but not when it's hot and thinner, that might suggest a heavier weight oil might help. If the light was on at 2000 rpm, I'd say there was nothing it could do, but when it's on only below 1000, I'd say it's worth a shot. I could swear reading the owners manuals of some '60's cars that mentioned if the oil light flickers when at a stop light, but goes off when you accelerate, that is normal.

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#4722972 - 04/10/18 06:32 PM Re: Oil light comes on at idle after warmed up. [Re: FlyNavyP3]
atikovi Offline


Registered: 04/27/10
Posts: 253
Loc: Suburban Washington DC
Originally Posted By: FlyNavyP3
If you just bought it and it has low/no oil pressure at idle why not just bring it back and get something else?


I didn't buy it at Walmart.

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