John Deere 4020

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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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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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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.
 

Gregsky88

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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.
 
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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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