Email Opie Oils and they will tell you Im sure. Think the problem is that when you empty the box most of the fluid stays inside so think you need to do a few flushes etc. I bought 10litres but have yet to change mine (R33 GTST).
I've searched loads for this info and haven't managed to find it either. I guess you can buy 10L and see where you get to with flushing and re-filling and measuring how much you use each time..
thanks guys, I will give rising sun a call and ask them. I didnt realise you have to flush it through a load of times, maybe 10litres will be needed then!!
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