Transmission oil for old Allis Chalmers: Diesel Fuel Lubrication Engine Additives  -- Tractor Maintenance Discussion Forum and Review Transmission oil for old Allis Chalmers: Diesel Fuel Lubrication Engine Additives -- Tractor Maintenance Discussion Forum

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Discussion Boards > Active Subjects > Messages as Posted > Diesel Fuel Lubrication Engine Additives Forum

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 05-29-2003, 20:02 Post: 55933
cutter



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 Transmission oil for old Allis Chalmers

I have an old D12 A/C that has been maintained with utility sae 10 motor oil in the gearbox and hydraulic system since it has been in the family (40 years). I have a jug of sae 20 and wondered if mixing it would harm the old girl. There has been an increased "gear noise" over the last few seasons, perhaps a bit heavier oil may help that? The old timers around here seem to think just about anything is OK for them, but I am not so sure. I only use it in the summer to bush hog but I don't want to cause harm. I was thinking perhaps UDT might be OK as well, no manuals for this and everyone I ask has a different answer!






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 05-30-2003, 06:33 Post: 55965
TomG

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 Transmission oil for old Allis Chalmers

Does utility means non-detergent oil? I can't imagine that the difference in viscosity between 10 and 20 weight would make much difference. Yikes, some old tractors use gear oil in the hydraulic systems! Detergent or non-detergent might make a difference.

There is the issue that the composition of some seals make them swell if some oils are used (that's the regular vs F-type auto TX fluid issue). There might be some chance that a synthetic is not compatible with the seals. I think Peters knows quite a bit about this.






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 05-30-2003, 18:43 Post: 56048
cutter



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 Transmission oil for old Allis Chalmers

Tom,

That would be non-detergent oil. My thought is that you would end up with 15w however the chemistry might not permit that. You may end up with part of the oil remaining a different viscosity than the rest, who knows. Peters is the resident expert on this subject.






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Discussion Boards > Active Subjects > Messages as Posted > Diesel Fuel Lubrication Engine Additives Forum

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