So, broken rocker arms tend to be from broken timing belt or belt installed incorrectly. It is possible he over tightened the valves and they slapped the pistons breaking the rockers.

Passenger side oil can be leaking from Valve cover/turbo oil feed/turbo oil drain/oil filter/oil sensor/front seal/oil pump
on a d56 the vacuum pump is on the back of the alternator, which drains to the pain, that can leak as well. Most of these will not stop leaking with the stop leak.

Tell him STOP DRIVING IT, these cranks are very hard to source, that crank is probably already ruined now though

injection pumps should be the same, if you swap a pump you will need the dial indicator tool to set the timing
the injectors are probably going to be different between the years

Cracks on the head are common from poor maintenance, they can/will cause overheating as they will crack into the coolant chamber sooner or later, and start burning coolant

Turbos are only rated 50k miles on these engines, same rating as the timing belt. you will either have a no wastegate TC05-10a, or a wastegated TD04-9b (not the same as a 3000gt)

Replacement, the only GOOD place i have found is kinugawa turbos.


If you block the oil feed, and oil drain, you can remove the turbo and make a custom downpipe off the manifold. It will be gutless, but the non turbo version isnt much different
(likely will not be able to hit more than 45-50mph)