i will reply as i know the answer to this better than some opti dealers
drain out the oil in the reservior on the engine as it will be better to have opti oil in there, if you have a syringe perhaps take the oil out with that thru the filler cap to save removing loosening any pipes etc
then top it up with opti oil
to bleed the system run the engine with the engine oil reservoir cap loosened and you will see the engine oil res fil up from the main tank, put the lid on just prior to it reaching the top and spilling, then makesure the lid on the main and engine reserviors are done up tight and you are done
i speak from experience as mine was not bled properly so i got help and read the workshop manual on bleeding etc