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Thanks for the responses. I am using Chevron drive train oil and not Cat oil. Does blending the two at 50/50 make a 30W50 multi-viscosity oil, or does it make 40W?

I am just beginning to study this oil anylisis stuff. I have always changed oil periodically in equipment, and had good luck. Now with costs rising on everthing (oil, parts, and equipment cost) I am willing to learn more. I take it that base oil has no Ca, Zn, etc. The value(quality)of an oil...

These results were sent to me from the manufacturer. They represent two tests done on the same oil. Are these numbers good for a THF? Ca .223 .256 Zn .107 .106 P .088 .088 S .337 .330

I just contacted Cross Oil by phone. They are going to email the anylisis on their two tractor hydraulic oils. These oils are high in Zn. They said that Zn is bad on silver metals, but the main reason for lower Zn in Hytran and others is to be environmental friendly.

Do the oil manufacturers provide a VOA? Is there more confidence in having an independent lab do the testing?

I thought zinc was bad for the "yellow" metals, therefor low zinc in common transmission/hydraulic applications is good. I am currently using Xtreme tractor hydraulic (Yellow bucket) made by Cross Oil Refining. I just found out that they make a Xtreme Ultra Premium TH (Black bucket). This...

I just found this website today. I hope to get alot of questions answered. I use Extreme hydraulic oil in all applications where trans and hydraulic are common. This is on JD and CaseIH tractors from 85 to 200 hp. I assumed since the label states that the Extreme meets Hytran and JD(Hyguard)...

I am replacing oil in a Cat 85 transmission. 50W will meet the recommendations for summer use (95degrees). However this is a little heavy for winter use. Can I mix 30 and 50? I will use Chevron oil. Is there another option? BTW 40W has to be special ordered and would be hassle. Trying to use...