This is what they recommend, sounds like B S to me! cut and paste:
FOR CONSUMER USE IN LAWN TRACTOR AND RIDING MOWER APPLICATIONS OIL CHANGING IS NOT EMPHASIZED AS MOST HOMEOWNERS AREN’T EQUIPPED OR IN THE HABIT OF CHANGING TRANSMISSION OIL. FOR MOST CUSTOMERS, THE TRANSAXLE WILL OUTLAST THE LIFE OF THE MACHINE. BUT, IT MUST BE SAID THAT CHANGING OIL WILL EXTEND THE LIFE OF THE TRANSMISSION. HOWEVER, IN COMMERCIAL AND HEAVY USAGE APPLICATIONS OIL CHANGING IS RECOMMENDED AFTER THE 1ST 50 HOURS OF OPERATION AND EVERY 200 HOURS, THEREAFTER. THE FILTER SHOULD NEVER REQUIRE CHANGING UNLESS THE TRANSAXLE IS REMOVED FROM THE TRACTOR OR RIDING MOWER AND OPENED FOR REPAIRS
FOR CONSUMER USE IN LAWN TRACTOR AND RIDING MOWER APPLICATIONS OIL CHANGING IS NOT EMPHASIZED AS MOST HOMEOWNERS AREN’T EQUIPPED OR IN THE HABIT OF CHANGING TRANSMISSION OIL. FOR MOST CUSTOMERS, THE TRANSAXLE WILL OUTLAST THE LIFE OF THE MACHINE. BUT, IT MUST BE SAID THAT CHANGING OIL WILL EXTEND THE LIFE OF THE TRANSMISSION. HOWEVER, IN COMMERCIAL AND HEAVY USAGE APPLICATIONS OIL CHANGING IS RECOMMENDED AFTER THE 1ST 50 HOURS OF OPERATION AND EVERY 200 HOURS, THEREAFTER. THE FILTER SHOULD NEVER REQUIRE CHANGING UNLESS THE TRANSAXLE IS REMOVED FROM THE TRACTOR OR RIDING MOWER AND OPENED FOR REPAIRS