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John Deere Tractors Discussion Forum
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Re: 1950 JohnDeere A and 1949 John Deere M

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Author  [Modern View]

08-13-2014 14:40:44

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15W40 is not "thinner oil". It will actually behave more like a 15 weight oil when cold (i.e., during startup when you'd like it to be a bit less viscous) and will act more like a 40 weight oil once at operating temperature. A quality named brand item is also likely vastly superior in about every regard as compared to anything that could have been purchased when these machines were new.

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Jonathan Gurley

08-14-2014 07:24:22

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 Re: 1950 JohnDeere A and 1949 John Deere M in reply to nlastovi, 08-13-2014 14:40:44  
I kinda like the idea of 15-40w rotella.. i always thought that it would be 15w when it gets warm.Im just uneducated about it.. is that the case when it warms up???

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08-14-2014 07:51:32

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 Re: 1950 JohnDeere A and 1949 John Deere M in reply to Jonathan Gurley, 08-14-2014 07:24:22  
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In general, multi-weight oil specified like 15w-40 means that the oil will be as viscous as 15 weight oil when cold and as viscous as 40 weight oil when hot (note that cold and hot are defined temperatures according to industry standard).

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08-14-2014 08:00:51

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 Re: 1950 JohnDeere A and 1949 John Deere M in reply to nlastovi, 08-14-2014 07:51:32  
there is a reasonably complete and reasonable coverage of motor oil at

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