KTM Duke General Discussion
I just had my 2021 390 adventure used in Beijing, the summer temperature can reach 100℉ and the winter can be as low as 10℉. So I am thinking using 10w50 in fall and winter and 15w50 in summer.
Here is the problem. In April I used 5100 10w50 for 1000 miles, I found this oil is thin after hard...