Just changed my rear shaft gear drive lube oil at 1,500 miles. Came out dark with a shimmer. Drain Magnet was full. Put in Mobil Delvac and rode 150 miles and then changed again. Super easy to do with a 17 mm box wrench, foot long vinyl tube and pump. I put the bike in the chock to stand it straight up and drain it within a minute of stopping to keep any particles suspended in the oil. My advice would be change yours early and often as it is super easy to do.