I'm doing the SP engine swap tomorrow.

My question is. can i use normal 4t oil in the gearbox or does it need to be motorcycle transmission oil.

The reason i ask is that my dad has sh*t loads of Castrol GPS 10w/40.

Also is there anything else i should be aware of with the engine swap?
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If you dont like the way that i ride.....Stop trying to keep up!!!!!

Update:

had a look at the oil situation and there appears to be some very clean (not like its going to get dirty) gearbox type oil in it. I think I may just leave it as the engine has had a very recent rebuild.
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If you dont like the way that i ride.....Stop trying to keep up!!!!!