hahahah semi syntethic also can use what..dont worry buddy ,never pour motor oil to our bike..damage our clutch plate .but only one brand i know said their product cant mix both REDLINE motor oil,higher gred ester inside called polyoil ester..more complex and give more heat resistance and protection...
the worst mean reuse oil and using cheapest oil then mix additive, dont use mineral oil if u already use syntetic oil,but semi syntetic can mix with mineral ,,NEVER DOWNGRADE OIL... but if we use mineral base if wanna UPGRADE to fully better flush first then..bla,,bla,,bla