According to Yamaha, replace the differential gear oil every 2 years or 2500 miles. When in doubt, check the owner's manual for maintenance requirements. You can buy the Yamaha gear oil with the friction modifiers for the differential at The Villages Golf Cart Store for a good price.
If you follow the Yamaha maintenance requirements for engine oil change and use Yamaha 10w-30 engine oil, they will guarantee your golf cart engine for 5000 hours. Clearly, this is a marketing ploy and I doubt they would ever have to pay off but there is a real expectation that the engines will last a long time with consistent maintenance. I change my engine oil every 50-75 hours, which is consistent with the Yamaha owner's manual, perhaps a bit more frequently. I believe 16 MPH is a typical average speed so 5000 hours on the engine would be 80,000 miles. Obviously a lot of parts would need to be replaced at those sorts of miles but with maintenance and replacement of those parts that normally wear (belts, alternators/starter motors, clutches, suspension parts, spark plugs, air filters, etc.), the Yamahas should last a good long time.
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Originally Posted by MorTech
12k miles? pffft. I bet there are more than a few carts in TV approaching 100k miles.
With my current activities, I am on track for 5k miles per year now.
As biker1 states, differential gear oil should be changed every 5 years/10k miles. If you have a limited-slip diff, don't forget to add the friction modifier fluid.
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