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1986 international s1900 w/ eaton fuller T14607a Direct drive #5433873 05/20/20 06:21 AM
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Autodiculous Offline OP
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so eaton fuller recommends a straight 50 weight oil for this trans. I have a few questions:

Why specifically a straight 50 weight?

Could I use something like a 15w50? could the 15w50 be an engine oil since I have not been able to find a 50 weight mobil 1 or equivalent fully synthetic gear oil or is there missing additives / corrosive additives that would not be good for a trans in that engine oil?

Is there a synthetic straight 50 weight that is as reliable as mobil 1 fully synthetic gear oil?

Thank you for help, pointers, and opinions!

Last edited by Autodiculous; 05/20/20 06:21 AM.
Re: 1986 international s1900 w/ eaton fuller T14607a Direct drive [Re: Autodiculous] #5433910 05/20/20 07:06 AM
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krismoriah72 Offline
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You can buy the straight 50 transmission oil at almost any truck parts store. Its very common. But Kind of Expensive. $150/ 5gallon


On my older 10+ year old trucks i used 80w90 which is very similar viscosity.


15w40 in the engine, 80w90 in trans and 85w140 in the rears just keeps things easy.

Re: 1986 international s1900 w/ eaton fuller T14607a Direct drive [Re: Autodiculous] #5433930 05/20/20 07:36 AM
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Rob_Roy Offline
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Use the recommended 50w oil. The additive package is different than the other products you mentioned. Synthetic products are available, but more expensive and likely not needed for your application.


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