transmission gear oil

The cost of synthetic like gear lube is shocking to me. I considered it briefly when I changed the fluids on my 730D last fall.

Consider that if you get the proper lubrication and a weight that keeps your transmission and rear end quiet that perhaps the biggest thing would be to change the fluid with some frequency as the biggest threat is water from condensation.

Extended change interval is often listed as a major reason for synthetic.

My decision was to go with SAE 90 as the service manual dictates.

John Deere Manual I believe recommends spring annual changes.

carpenter

~I guess the pro's of synthetic gear oil would be easier trans shifting at below 15°F & possibly more miles per gallon of fuel.

~The con's would be more trans noise, higher probably of oil leaks at the gaskets, covers, & especially the clutch pulley.. If the synthetic gear oil has a high concentration of EP additives [most do] then there is a greater chance of yellow metal damage in the trans or gear tooth pitting under certain conditions [not a real big concern though]...

JDClooney@aol.com