hello as manual wren recommend 3%.

actually i read you can even use Castrol TTs oil as oil...on the 44

i asked Wren time ago if he was "healty" to run the 44 on 5 or 6% and they said to me, that may be not good..so i use 3%

for the pump, i changed mine after she stuck, and at the first run i increased the trottle very slow, up to full , givin the Fadec time to set herself.