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#4382000 - 04/17/17 08:16 PM John Deere 4020
Gregsky88 Offline


Registered: 04/17/17
Posts: 2
Loc: Texas
I have a late 1960's model John Deere 4020 propane fuel tractor.
Can someone provide a good quality oil recommendation To use besides the John Deere brand?
My understanding is that the oil should be low ash non detergent multi viscosity.
I am in the panhandle of Texas with recordtemperatures ranging from -10 to 110 degrees.
Thanks in advance.

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#4382021 - 04/17/17 08:39 PM Re: John Deere 4020 [Re: Gregsky88]
Farmer Offline


Registered: 08/05/15
Posts: 1086
Loc: BC Canada
Why a non detergent oil? You won't find any multi viscosity oils that are non detergent.

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#4382026 - 04/17/17 08:48 PM Re: John Deere 4020 [Re: Gregsky88]
jhellwig Online   content


Registered: 07/01/13
Posts: 1336
Loc: Ottumwa, Iowa
Use John Deere hy-guard. It isn't any more expensive than anything else and is the correct fluid. I don't know off the top of my head if the are wet clutch and brakes but using the wrong fluid will ruin those.

Does the tractor have power shift?
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#4382034 - 04/17/17 09:03 PM Re: John Deere 4020 [Re: Gregsky88]
Pop_Rivit Offline


Registered: 02/09/08
Posts: 6367
Loc: Midwest
Rotella 15W40 will do just fine in your 4020.

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#4382044 - 04/17/17 09:13 PM Re: John Deere 4020 [Re: Gregsky88]
FlyNavyP3 Online   content


Registered: 07/04/16
Posts: 1066
Loc: Jacksonville, FL
Apples and oranges I suppose but we had a 4020 Diesel on our farm for decades. It ran in Farmers Co-Op 15w40 for 30+ years, still running today but no longer farming. I agree that any 15w40 would be well suited to your application. Walmart 15w40 is affordable as is Tractor Supply Travelers brand.
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#4382178 - 04/18/17 05:44 AM Re: John Deere 4020 [Re: Gregsky88]
Gregsky88 Offline


Registered: 04/17/17
Posts: 2
Loc: Texas
Thanks for the responses. This 4020 is a power shift and after double.checking the tractor supply specs and getting input from tractor forums I am using the tractor supply hydraulic oil and working just fine.
I don't load this tractor up really heavy just trice a year dishing and drilling so I will plan on using the Tractor Supply 15W40 Premium for the engine oil.
I was told years ago by my farmer bro-in-law (rip) that if you start using a detergent oil in an engine that has run non detergent it may start using oil. Not sure this would be the case since I've only owned this tractor for a short while and I understand propane engines are very clean running.
Thanks again for the responses.


Edited by Gregsky88 (04/18/17 05:45 AM)

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#4382227 - 04/18/17 07:16 AM Re: John Deere 4020 [Re: Gregsky88]
bioburner Offline


Registered: 09/19/16
Posts: 1418
Loc: Minnesota
I put many hours on a 4020. Propane is very clean and many indoor forklifts use propane. Probably will not see any discoloring of oil between changes.
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