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05-14-2020, 02:17 PM
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#1
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Junior Member
Join Date: Mar 2018
Location: League City, TX
Posts: 7
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HELP!!! Oil in the Coolant Reservoir
All, I have a 2011 Fleetwood Discovery with the 8.3L (ISC) and I noticed a little
oil in the overflow coolant tank. I feared that I had a blown head gasket but there is No white smoke and it doesn't to be loosing oil. I changed the oil and the oil looked good. Not cloudy like it has water in it. Is there a Transmission or Oil cooler on the coach that uses the same coolant system as the motor? 
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05-14-2020, 03:23 PM
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#2
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Senior Member
Monaco Owners Club
Join Date: Jun 2014
Posts: 14,591
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Was the oil color black? If it was engine oil it would be black, transmission a lighter brown or reddish color.
Some radiators do have the transmission oil cooler built into the radiator. You should be able to crawl underneath and trace your transmission lines. If they terminate into the radiator you may have a an internal cooler.
__________________
Jim J
2002 Monaco Windsor 38 PKD Cummins ISC 350 8.3L
2005 Jeep Grand Cherokee w/5.7 Hemi
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05-14-2020, 03:24 PM
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#3
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Senior Member
Join Date: Jul 2014
Posts: 35,417
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Yes, diesels use oil coolers that sit in the engine water jacket.
Since oil pressure is higher then cooler pressure, the slightest leak in the oil cooler will enter the coolant. Since oil floats on top of water, it moves to the top of the radiator, where it can get pushed out into the overflow tank.
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05-14-2020, 03:44 PM
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#4
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Senior Member
Join Date: Oct 2017
Location: Boston,ma
Posts: 908
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You have what could or could not be a major issue. If you are not comfortable with diagnosing it get a professional opinion from someone you can trust. ( that would not be campers world ) ( Just my own opinion )
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05-16-2020, 05:41 AM
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#5
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Senior Member
Texas Boomers Club Holiday Rambler Owners Club
Join Date: Jun 2002
Location: What? Like right now? ;-)
Posts: 1,302
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get a pressure test done of the cooling system
__________________
2003 Scepter 40PDBB - Roadmaster RR8S - Cummins ISC350 - purch aug16
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05-16-2020, 07:18 AM
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#6
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Senior Member
Forest River Owners Club Ford Super Duty Owner
Join Date: Jul 2012
Location: So Calif
Posts: 3,533
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I agree that a pressure test and inspection would be prudent.
Not sure how much oil you have in there, but usually not a good sign, especially on a diesel engine. You may have caught the problem early on.
__________________
2020 Coachmen Leprechaun 270QB (COA Member)
Jeep Wrangler toad for the dirt
"Well done is better than well said"....Ben Franklin
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05-16-2020, 08:06 AM
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#7
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Senior Member
Texas Boomers Club Holiday Rambler Owners Club
Join Date: Jun 2002
Location: What? Like right now? ;-)
Posts: 1,302
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ypu can also take a sample of the coolant and it will tell you a concentration. If its a prob with the oil cooler it good be $$.
__________________
2003 Scepter 40PDBB - Roadmaster RR8S - Cummins ISC350 - purch aug16
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05-17-2020, 10:03 AM
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#8
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Registered User
Triple E Owners Club Ford Super Duty Owner
Join Date: Apr 2013
Posts: 1,745
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Quote:
Originally Posted by egwilly
I agree that a pressure test and inspection would be prudent.
Not sure how much oil you have in there, but usually not a good sign, especially on a diesel engine. You may have caught the problem early on.
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Ok pressure test what?
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05-17-2020, 10:19 AM
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#9
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Senior Member
Join Date: Oct 2016
Posts: 1,898
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Quote:
Originally Posted by Ted Lambert
Ok pressure test what?
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they put a special cap on your cooling system and pressurize it, then monitor it for a period of time. if the pressure drops you have a leak somewhere. I would have an analysis of the cooling water done. they should be able to tell you just what the oil is, lube oil or trans oil.
Jay D.
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05-17-2020, 10:20 AM
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#10
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Senior Member
Foretravel Owners Club
Join Date: Apr 2016
Location: Home is Where WE PARK IT...
Posts: 6,051
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Yup, sounds like an oil cooler...get your stimulus ready and go see Cummins..
__________________
Retired truckdriver,
'02 Foretravel... "This Shack will do"
being pushed by an '06 Scion xB
SKP's of Box Elder, South Dakota
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05-17-2020, 11:13 AM
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#11
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Senior Member
Join Date: Jul 2014
Posts: 35,417
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Don't pressure test the cooling system.
If the oil cooler is leaking it could push coolant into the oil, a much worse condition then oil in the coolant.
In most cases it won't tell you anything anyway. Oil pressure runs between 30 amp 60 lbs. Coolant is at 16 lbs. The hole in the cooler often only leaks oil out.
Unless it was caused by human error, oil in the coolant is almost always the oil cooler.
Have the cooler removed and pressure tested for a diagnosis.
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05-18-2020, 12:51 PM
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#12
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Senior Member
Join Date: Jan 2017
Location: Titusville, FL
Posts: 5,164
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I've always heard that antifreeze in the transmission will kill it dead in short order. I would not do anything that might encourage that situation. Oil (or tx fluid) in the antifreeze is something to get concerned about but not near as bad as anitfreeze in the transmission.
__________________
When seconds count, the police are only minutes away.
2023 Grand Design 2600RB, 2022 F-350 King Ranch tow vehicle, Titusville, FL when not on the road
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05-18-2020, 02:38 PM
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#13
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Community Moderator
Monaco Owners Club
Join Date: Jul 2016
Location: Central, Arkansas
Posts: 11,285
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Quote:
Originally Posted by twinboat
Don't pressure test the cooling system.
If the oil cooler is leaking it could push coolant into the oil, a much worse condition then oil in the coolant.
In most cases it won't tell you anything anyway. Oil pressure runs between 30 amp 60 lbs. Coolant is at 16 lbs. The hole in the cooler often only leaks oil out.
Unless it was caused by human error, oil in the coolant is almost always the oil cooler.
Have the cooler removed and pressure tested for a diagnosis.
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Good Advice here !
__________________
2004 Beaver Monterey Laguna IV
Cummins ISC 350HP Allison 3000 6 speed
2020 Chevy Equinox Premier 2.0t 9 speed AWD
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05-18-2020, 05:56 PM
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#14
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Registered User
Monaco Owners Club
Join Date: Apr 2020
Posts: 161
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Quote:
Originally Posted by Jay D.
they put a special cap on your cooling system and pressurize it, then monitor it for a period of time. if the pressure drops you have a leak somewhere. I would have an analysis of the cooling water done. they should be able to tell you just what the oil is, lube oil or trans oil.
Jay D.
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I'm not sure I like this idea. If there is a leak between transmission or engine oil lines inside the engine cooling system radiator, would not a pressure test of the cooling system, with the engine not running and zero pressure in the oil line, drive coolant into the oil line and circulate it into the transmission or crankcase?
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