GU 3 litre "hand grenade" engine

[Fred Schenck]

Cross countgry 4X4 Sell handgrenade kits for the patrol and everthing you need will be in it see the bottom of the attached page at this link. http://www.crosscountry4x4.com.au/pr...hp?category=42

I read a lot about 3 litre GUs blowing engines. I also believe there were some upgrades, including increased oil capacity.
Does anyone know when (if?) any upgrade was introduced.
Any war stories on blown engines?
I have a 2006 GU, 3 litre that seems to work fine so far :-)