SYN3 is a Group III oil. NOT a full synthetic Group IV. Definitely use a FULL synthetic engine oil in the engine, FULL synthetic gear oil in the tranny, and fit-for-purpose wet clutch - chaincase lube in the Primary.
Check this out:
Oil Suggestions For Harleys - Harley Davidson Community
TQ
Check this out:
Oil Suggestions For Harleys - Harley Davidson Community
TQ