yea id say im going through about double that . Im using castol edge 0w 30
That is far too thin. Use a good fully synth 5W40 or 10W60.
I wouldn't run a 10w60 on a K20. 5w30 or 5w40 will be idea.
TGM highly recommend it and I've had no issues with it. Consumption is greatly reduced.
It's not a normal K20 oil, I run it in my B18, but maybe as your engine uses oil it needs it?
Dunno mate, TGM put it in all DC5's when he services them.
im using castrol edge 0w 30 aswell mate, i had it changed at around september time and i have only used just over half a litre, ask any honda specialist they all recommend 0w 30 for ep3 type R.