1967 Oliver 1355 tractor hydraulic oil.

[Big0veralls]

Hello all. This tractor calls for 20w40 api ms API for the transmission and hydraulic system. I have read a thread that says for 40 wt to use api 150 hydraulic oil I believe. I read one place that listed 0w, 10w, 15w, 20w as the deciding information and nothing to do with the operating temperature rate weight. I’ve also seen charts that start similarly at the 0W and then up to15w but they drop the w and then they go to 20, 30 and so on. Do I just use 15w40 engine oil which is readily available, not too expensive and lets water separate and fall to the bottom of the pan instead of emulsifying(if I understood what I read about it). Or, do I buy whatever iso hydraulic fluid is correct and If I do buy the iso hydraulic fluid do I use the winter or w rating weight of 20 or the normal operating temperature rating of 40 as my guide? Do those charts like the one in the picture all state the winter weight and just leave the w off when it gets to 20? I’m sure I’m overthinking it. Maybe you use the non w chart number conversion in hotter temps and the w number in winter. I hope I’m not too confusing because this is my first dive into learning about this stuff concerning this tractor. I believe my brother in law has been using some kind of heavy equipment hydraulic fluid but the really three point controls have to be worked a lot before the thing starts moving. Someone please school me in this is you have the time I would be very grateful.

 

[Jetronic]

The winter rating only matters in regards to the coldest temperature you want to start and operate the vehicle.

Those charts can't be used to compare the winter ratings of multigrade oils, only for monograde oils. Back when all oils were monograde, they had winter oils like 0W, 5W, and up to 25W. Those were classed by their 212°F viscosity but for decades now they have proper winter testing for multigrade oils.

a 15W40 can be used down to 0°F, beyond that there are no guarantees.

Hydraulic oils are classed by their 100°F viscosity, engine oils by their 212°F viscosity. ISO 150 is quite thick compared to what a 15W40 would be at 100°F. I would go with 15W40, or a gear oil as you say the transmission shares the same oil.

 

[Sumboodie]

1000 THF is about a 15w30 and is used for tractor trans, hydraulics, finals, etc.

 

[Big0veralls]

The winter rating only matters in regards to the coldest temperature you want to start and operate the vehicle.

Those charts can't be used to compare the winter ratings of multigrade oils, only for monograde oils. Back when all oils were monograde, they had winter oils like 0W, 5W, and up to 25W. Those were classed by their 212°F viscosity but for decades now they have proper winter testing for multigrade oils.

a 15W40 can be used down to 0°F, beyond that there are no guarantees.

Hydraulic oils are classed by their 100°F viscosity, engine oils by their 212°F viscosity. ISO 150 is quite thick compared to what a 15W40 would be at 100°F. I would go with 15W40, or a gear oil as you say the transmission shares the same oil.

Thanks for that knowledge. I was leaning toward the 15w40. Was just really concerned that it might have something harmful to the hydraulic system.

 

[Big0veralls]

1000 THF is about a 15w30 and is used for tractor trans, hydraulics, finals, etc.

I appreciate that info. I have a little better understanding. Probably will do the 15w40 since it’s the closest to the 20w40 it originally called for.

 

[Sumboodie]

I appreciate that info. I have a little better understanding. Probably will do the 15w40 since it’s the closest to the 20w40 it originally called for.

I'd be less worried about exact viscosity and more using oil made for the specific purpose.
Torque Force 30 would be another option. CAT calls it TO4 or TDTO.
Deere calls it Hy-Gard

Not sure best option for your 60 year old tractor though, only have been around an 1855 and never researched fluids for it.

 

[Creekside]

Is this for the Fiat built 1355 or the G-1355 that was very similar to the Minneapolis Moline? If it's the Fiat built tractor then most any readily available UTF would work fine. We have a Similar Allis Chalmers 5045 that I use Hygard in.

 

[Chris142]

Thanks for that knowledge. I was leaning toward the 15w40. Was just really concerned that it might have something harmful to the hydraulic system.

I dont think there is much to harm. A pump,lines and cyliners with seals.

I run sae 30 in the hydraulics in my old Case.