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Hey Big Orn,

80W90 - this is THICK STICKY stuff!

Although, it is W rated, you are getting away using it in Texas where your ambient temp is high but would imagine that some of our Zetor driving friends in Scandianvia would have problems in Winter with this. I use SUTO (Super Universal Tractor Oil) which has a viscosity of 20W50 or 10W40. I also used this for my power steering (see seperate post) but had problems as it is too viscous.

The hydraulic oil also lubricates the back axle and gearbox. I can't see that it would do any harm to the hydraulic cylinders. However, it will put extra pressure on the hydraulic pump when cold due to its viscosity. "An oil with too high a viscosity may not pump to the proper parts at low temperatures and the film may tear at high rpm".

Tom

[QUOTE="treaney, post: 329, member: 1728"] Hey Big Orn, 80W90 - this is THICK STICKY stuff! Although, it is W rated, you are getting away using it in Texas where your ambient temp is high but would imagine that some of our Zetor driving friends in Scandianvia would have problems in Winter with this. I use SUTO (Super Universal Tractor Oil) which has a viscosity of 20W50 or 10W40. I also used this for my power steering (see seperate post) but had problems as it is too viscous. The hydraulic oil also lubricates the back axle and gearbox. I can't see that it would do any harm to the hydraulic cylinders. However, it will put extra pressure on the hydraulic pump when cold due to its viscosity. "An oil with too high a viscosity may not pump to the proper parts at low temperatures and the film may tear at high rpm". Tom [/QUOTE]

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