Kevin - Here's the info from the 430 Technical Manual: 430 Diesel Engine Oil - SAE 15W-40 is preferred. If you use another viscosity, it's recommended that service interval for oil and filter changes be reduced by 50%. Recommended brand is John Deere TORQ-GARD SUPREME PLUS-50, or John Deere TORQ-GARD SUPREME, or other oil meeting one or more of the following API Service Classifications: CG4, CF4, CE. If an oil other than listed above, John Deere again recommends reducing the service interval for oil and filter changes by 50%. 430 Transmission/Hydraulic Oil - John Deere HY-GARD or John Deere Low Viscosity HY-GARD. You may also use John Deere UNI-GARD or John Deere BIO-HY-GARD. If you change the hydro oil, make sure you allow the old oil to drain completely, and change the filter as well. When installing the new transmission filter, fill 1/2 to 2/3 with fresh hydro oil. Hope this helps. - Dave
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