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Message: <blockquote data-quote="jerry" data-source="post: 66034" data-attributes="member: 931"><p>the hydrostatic /hydraulic reservoir is in the engine bay on the right up by the firewall. It has markings on it for the level. fluid is 10-30 motor oil. Hard to say about the growling / whining noise. If you run it at low rpm it will growl a lot more than at higher rpm.  Mine is fairly quiet going straight forward or back but turning it makes a growly whining noise. To me its normal. If the gear boxes tend to go down on oil you may want to modify them so they use the chain case lube. I did that and cant say whether it is good or bad but I don't have to check the gear box oil level anymore. If you run it at above 2000 rpm and it  just makes some growly hydraulic noises I'd use it , if it is making metallic grinding noises then that is different.</p></blockquote><p></p>