redline is a little too thick of an oil to be using u should really be using honda mtl. but its a common problem regardless if the pinion gears in ur tranny arent aligned then simply allow the clutch to rotate ever so slightly until u get it into gear, its a normal issue. and nothing to be concerned with. i strongly doubt its an early warning sign but i do not recommend redline due to its thickness which can cause bad things over time. i would recommend a 5-30w oil even in ur tranny.