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Here is the back side of a one gallon jug for Carquest "Premium Tractor Hydraulic Fluid". The only question that remains (for me anyway) on this subject is if in fact Allison specification Type C3 superseeds Type C2, which is specified in the '68 TM.

RE: Re: 5 Ton Power Steering Question Found out that hydraulic fluid labeled AW32 actually has a viscosity rating equivalent to SAE 10. The recommended fluid appears to be "Premium Tractor Hydraulic Fluid", which has an equivalent SAE rating of 10W-20 or so. It's used for transmissions and...

Found this in a PS mag article on the M915 series trucks.

RE: Re: RE: 5 Ton Power Steering Question Thanks Cabell.

Looking at hydraulic oils, we have a whole new world to explore. :-) Anti-wear properties....proper lubrication of the pump.... Sold my supply of Dexron to the local shop here for less than half price, he was happy and I'm now looking for some 10 weight hydraulic oil. That will be for the...

Found another note supporting the SAE 10W viscosity oil for the steering system (not the steering gear). The oil specified for the hydraulic crane is SAE 10W also, but since it hasn't been in stock locally, I have always used 30W hydraulic oil. Gotto find some 10W hydraulic oil it seems.

RE: Re: RE: 5 Ton Power Steering Question My jury is still out on this one. :-) There was a multi issue article on oils in the MVM a few years ago, I got some reading to do....

Re: RE: 5 Ton Power Steering Question Ref Transmission fluid: For one thing, conflicting info from the manuals. The TM -10 calls for OE 10W, the LO calls for OE (could be 30, could be 10) and the Transmission TM calls for Transmission fluid type C2 (see attached). In addition the newer...

I'm in a similar situation, got five gallons of ATF (Dexron) on the shelf now for the xm757, but am having second thoughts about replacing the Allison transmission fluid with it. The LO calls for 10W motor oil (OE 10) and that's what's in the transmission now from the looks of it. I have mixed...