M1 0w20 & 0w30 oil bottle states something to the effect : " Fine / safe for all vehicles which stipulate 5w20 / 5w30 oil weights" . Is there ever an instance or situation when it is not fine / safe to use a 0w20 / 0w30 oil in place of 5w20 or 5w30 the vehicle manual or oil fill cap recommends ?