What hydrostatic oil do i put in simplicity sunstar 18hp?

For a Simplicity Sunstar 18HP, you should use a high-quality hydrostatic transmission oil, typically a 20W-50 or 15W-40 grade oil designed for hydrostatic systems. It's important to check the owner's manual for specific recommendations, as some models may have particular requirements. Ensure the oil meets the necessary specifications for your mower's hydrostatic system to maintain optimal performance and longevity.