Polaris does a lot of R&D so I'm sure it's good in your Kingpin. I don't know if it's synthetic or mineral based, but either can have good heat transfer, which is what I'd be wanting in a big V-twin air cooled engine. One accessory I would get is victory's oil temp gauge dipstick. You can buy it on line or from dealership. This lets you know when the oil is hot enough to ride fast and if the oil gets too hot to slow down :~)