Is gear oil the same as transmission oil, when it come to dirt bikes?

i have a 02 kx 125 and ive been using belray gear saver transmission oil SAE 80W and i just when to a mechanic store and told him i needed some of this oil and he gave me Havoline gear oil SAE 80W - 90 api service gl-5 . im a little scared to put it into my 2 stroke kx. so all i want to know is it the same thing and if it will work..Is gear oil the same as transmission oil, when it come to dirt bikes?
im not an expert with oil types but when it comes to oil for your gears it doesnt need to be the exact recommended type,





it is used to lubricate your gears only if the oil is slightly different to what it should be its ok,








cheersIs gear oil the same as transmission oil, when it come to dirt bikes?
DO NOT use gear oil in the crankcase of a 2 stroke.


It's to thick.


It will hinder the movement of transmission components and cause the clutch plates to stick, putting unnecessary ware on the transmission, because the clutch isn't fully disengaging from the engine.


Use what the manufacture recommends - 10W-40 motor oil
You should be fine with putting the gear oil in instead of your old transmission oil. They are basically the same thing. Companies market them differently but you should be fine as long as it is the same weight (or weight range). Going from 80W to 80W-90 shouldn't be a problem. If you have problems or have had good experiences with the Belray oil, you may want to continue using that.
there isnt to much difference but motocross bikes are under much more stress than an ordinary car . Personally i would take it back and get the right gear oil, then slap the guy in the face for giving you that oil.
I would use a good high quality synthetic gear oil like Mobil 1 actually. But that oil you have should be pretty much the same. It's just gear oil.
The gl-5 oil (Hypoid) will contain more sulfur that may mess with any brass parts in the trans.