One of the mechanic here advice that not to use fully shythetic on bike as it's good for the engine but not the gear. any comment? (I've changed to fully shythetic at 2000km anyway). BTW, how offen you change the oil for :-
1) Fully synthetic - ???KM or miles
2) Semi synthetic - ??? KM or miles
3) water base/non synthetic - ??? km or miles.
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