got a new KTM superduke with a 990 water cooled v-twin. manual specifies a 10w-50 oil. I used motorex 10w-60 for the first oil change. gearbox/clutch works perfectly. motorex is priced at $15+ a liter. I want to look for a cheaper alternative. SDR does not have an oil cooler so I want to go at least 50 weight. I plan to follow the factory change interval at 4600 miles.