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Oil light comes on at idle after warmed up. #4722906
04/10/18 04:51 PM
04/10/18 04:51 PM
Joined: Apr 2010
Posts: 293
Suburban Washington DC
atikovi Offline OP
atikovi  Offline OP
Joined: Apr 2010
Posts: 293
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?

Re: Oil light comes on at idle after warmed up. [Re: atikovi] #4722909
04/10/18 04:54 PM
04/10/18 04:54 PM
Joined: Jun 2003
Posts: 5,921
Illinois
SHOZ Offline
SHOZ  Offline
Joined: Jun 2003
Posts: 5,921
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.


2008 Hyundai Accent 1.6L 5 sp manual hatchback
2010 Hyundai Genesis Coupe Track 2L Turbo 6sp manual
Re: Oil light comes on at idle after warmed up. [Re: atikovi] #4722912
04/10/18 04:58 PM
04/10/18 04:58 PM
Joined: Dec 2003
Posts: 9,801
Florida, Cape Coral
Eddie Offline
Eddie  Offline
Joined: Dec 2003
Posts: 9,801
Florida, Cape Coral
You might want to replace the oil pressure sensor or have the pressure checked with a gauge.


CX5 Touring 2.5L :-)
Re: Oil light comes on at idle after warmed up. [Re: Eddie] #4722913
04/10/18 04:59 PM
04/10/18 04:59 PM
Joined: Mar 2004
Posts: 20,758
Upstate NY
Donald Offline
Donald  Offline
Joined: Mar 2004
Posts: 20,758
Upstate NY
Originally Posted By: Eddie
You might want to replace the oil pressure sensor or have the pressure checked with a gauge.


This.


2015 Subaru Forester 2.5 engine/CVT
2015 Ford F250 w/Powerstroke
2016 Subaru Crosstrek CVT (wife's)
Re: Oil light comes on at idle after warmed up. [Re: atikovi] #4722918
04/10/18 05:09 PM
04/10/18 05:09 PM
Joined: Apr 2010
Posts: 293
Suburban Washington DC
atikovi Offline OP
atikovi  Offline OP
Joined: Apr 2010
Posts: 293
Suburban Washington DC
Don't know what weight was used as I just picked it up. I will check with a gauge.

Re: Oil light comes on at idle after warmed up. [Re: atikovi] #4722920
04/10/18 05:13 PM
04/10/18 05:13 PM
Joined: Sep 2015
Posts: 5,858
Kalifornia Kollective
BrocLuno Offline
BrocLuno  Offline
Joined: Sep 2015
Posts: 5,858
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


Formerly in marine engineering. In an earlier life I owned my own petroleum tank truck, and hauled for the majors and independent's.
Re: Oil light comes on at idle after warmed up. [Re: atikovi] #4722923
04/10/18 05:21 PM
04/10/18 05:21 PM
Joined: Jan 2009
Posts: 6,205
New England
gathermewool Offline
gathermewool  Offline
Joined: Jan 2009
Posts: 6,205
New England
Dipstick indicates full of oil?


'14 Forester XT FA20DIT (Cobb Stage 1)
Edge 0W-40 + FU filter
'15 Legacy FB25 (OEM Stage, uh, neg. 7?)
Edge 0W-20 + FU filter
Re: Oil light comes on at idle after warmed up. [Re: atikovi] #4722930
04/10/18 05:35 PM
04/10/18 05:35 PM
Joined: Apr 2010
Posts: 293
Suburban Washington DC
atikovi Offline OP
atikovi  Offline OP
Joined: Apr 2010
Posts: 293
Suburban Washington DC
But of course.

Re: Oil light comes on at idle after warmed up. [Re: atikovi] #4722933
04/10/18 05:46 PM
04/10/18 05:46 PM
Joined: Aug 2009
Posts: 3,900
Pittsburgh,PA U.S.A.
JimPghPA Offline
JimPghPA  Offline
Joined: Aug 2009
Posts: 3,900
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.


Boy will I be happy when ALL vehicles on public roads are autonomous.


JimPghPa

Re: Oil light comes on at idle after warmed up. [Re: atikovi] #4722934
04/10/18 05:47 PM
04/10/18 05:47 PM
Joined: Mar 2017
Posts: 5,462
Soviet State of Washington
PimTac Online content
PimTac  Online Content
Joined: Mar 2017
Posts: 5,462
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.


2017 Mazda CX-5 Grand Touring

Valvoline Advanced Synthetic 0w20
Mobil 1 M108A EP filter

Re: Oil light comes on at idle after warmed up. [Re: atikovi] #4722948
04/10/18 06:09 PM
04/10/18 06:09 PM
Joined: Jul 2016
Posts: 1,482
Jacksonville, FL
FlyNavyP3 Offline
FlyNavyP3  Offline
Joined: Jul 2016
Posts: 1,482
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.


Luke
P-3C and P-8A Maritime Weapons and Tactics Instructor, Instructor Tactical Coordinator and Mission Commander
Re: Oil light comes on at idle after warmed up. [Re: PimTac] #4722958
04/10/18 06:19 PM
04/10/18 06:19 PM
Joined: May 2014
Posts: 1,232
Minnesota
philipp10 Offline
philipp10  Offline
Joined: May 2014
Posts: 1,232
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.

Re: Oil light comes on at idle after warmed up. [Re: atikovi] #4722970
04/10/18 06:29 PM
04/10/18 06:29 PM
Joined: Dec 2010
Posts: 3,353
Los Angeles, California
Gokhan Offline
Gokhan  Offline
Joined: Dec 2010
Posts: 3,353
Los Angeles, California
I once had the same thing because the oil-pressure sensor was leaking at the threads.


1985 Toyota Corolla LE, 4A-LC engine, ~ 270,000 M
Toyota (TGMO) 0W-20 SN high-moly GTL (new formulation)
Mobil 1 EP M1-103 filter, 90430-12031 drain gasket
Re: Oil light comes on at idle after warmed up. [Re: philipp10] #4722971
04/10/18 06:30 PM
04/10/18 06:30 PM
Joined: Apr 2010
Posts: 293
Suburban Washington DC
atikovi Offline OP
atikovi  Offline OP
Joined: Apr 2010
Posts: 293
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.

Re: Oil light comes on at idle after warmed up. [Re: FlyNavyP3] #4722972
04/10/18 06:32 PM
04/10/18 06:32 PM
Joined: Apr 2010
Posts: 293
Suburban Washington DC
atikovi Offline OP
atikovi  Offline OP
Joined: Apr 2010
Posts: 293
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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