The DL1000 looks to be higher mileage capable without engine work. There is the 400,000 mile plus example and a couple of people have reported more than 200,000 miles. The DL650 looks to need new cam chains around 150,000 miles. Maybe that's because the smaller bike runs longer cam chains over the cams while the bigger bike runs much shorter cam chains to gears below the cams and drives the cams with those gears.