I just got off the phone with Volvo Penta and they tell me that your oil 41100129 for the Bow Thrusters is no longer offered by Volvo Penta. It is a “pending obsolete” which means that it does not come as an obsolete part, but the purchasing people no longer try to source it.
There are two of these left in Sweden which I might be able to grab, but it means that I have to do it as a 72 hour which has a $250 charge.
The other option is wait and eventually we may get the oil in the future.
The final option is for me to get you an aftermarket oil (the oil used in Vetus thrusters).
Please let me know.