Originally Posted by
The B Word
The F3 had bigger oil tanks than the GR - I’ve done more than 10 hrs in a Tonka without running out of oil in accordance with the RTS.
Not correct I am sorry. The F3 Mk104 engine was functionality the same as the Mk103 engine in the GR4.
The only difference was the longer 104 Exhaust System and the DECU.
The capability for significantly longer flights was the result of improvements to the oil system that reduced oil consumption.