As pretty much noted TD42,s are higher in price and depending on the age some insurers market value is way lower than what you pay. Mine is 99 GU and cost me 19k and AMMI notes 8k market value. My 2003 GU 3ltr (for sale) has a market insurance value of 16k and I am struggling to get 13k for it. 3lts had piston issue fixed by the 03 model but there is the head issues you will read about them up to 04 if I am correct?

They are a good little engine overall, just look for ones with nads fitted. Good luck