5K normally,but HD website under SYN3 says You can change at 10K or at time of winter storage.I am going to try it ,while watching how dirty oil gets.It it really gets black I will change earlier.3800 miles now and oil looks like it was changed yesterday!
I ran 5K on my 2011 and the engine oil is dirty with the Syn3. On my 2014 I'm also doing 5K for engine and 10K for the others per Manual. I use Mobile 1 and I am happier while saving money.