![]() ![]() After hours of research, I think that Deeres. Chevron also make a Full Synthetic that is JD20C & JD20D compatible. Chevron makes Deeres HyGuard & Low Viscosity HyGuard. Synthetic Tractor Hydraulic/Transmission Oil SAE 5W-30 ATH - AMSOIL. ![]() But it makes sense, since Chevron was the company who pioneered Group III synthetic development and is the primary source for Group III base oil in the country. wh5208speed said: Here is the Amsoil that is JD20C & JD20D compatible. It is a very high quality Group III synthetic. Just found out on the MSDS sheet for JD20D. the JD20D gallons are TY22000 the quarts are TY22035 The viscosity index has some bearing on the NOACK volatility, or "cook off" of the oil. You can have, say, a 10w30 conventional with a VI of around 140, and a 10w30 synthetic with a VI of 175. Viscosity index is the category of the base oil stock, with conventional oils down lower in number and higher end synthetic base oils up higher in number. Side note: viscosity index has nothing to do with viscosity "weight". Again, for my dollar, only JD20D is what I want. Does anyone know if there is an alternative (i.e. And the JD20c has a TBN of 11 whereas the JD20D has a TBN of 13. At best, it is a conventional/synthetic blend. ![]() In contrast the JD20C has a viscosity index of 140. For my dollar, I would only use the JD20D year round, irregardless of temperature and who is blending it. To pick the right alternative to John Deere Hy-Gard oil, you must first know its specifications (JDM J20C and J20D) clearly. Since Mobil is the primary source of Group IV PAO base oil stocks in the country, I would suspect they might be the source blender for the JD20D. Even the Amsoil product only comes in at a 171 viscosity index. Low-Viscosity Hy-Gard has an ISO 32 Viscosity Grade. Low-Viscosity Hy-Gard is compatible with hydrostatic fluid and can be added to systems which contain hydrostatic fluid. Thank you in advance for your help and assistance. Low-Viscosity Hy-Gard replaces John Deere All-Weather Hydrostatic Fluid and should be used as a direct replacement for all applications recommending hydrostatic fluid. It has a viscosity index of 195, which puts it squarely into Group IV PAO synthetic territory. Wanted to know if someone has a recommendation on a good national brand with complete name, as an equivalent or better for the JD J20C Hygard low viscosity trans/hydraulic oil I want to replace the transmission fluid in my JD 6x4 gasoline Gator, Yr 97. In terms of the JD motor oil, the tuffgard is made by Conoco and the Plus4 is made by Imperial. ![]()
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