Nissan SD33T engine info/problems?

A very reliable and robust engine that makes good power and torque for it's vintage. Oil change intervals are important due to the 4-main bearing crankshaft. I would suggest an after market by-pass filter/purifier such as a Franz. The oil pressure switch has a low-pressure cut out circuit that will shut down the engine if oil pressure falls below 8psi(I think), this safe guard mechanism can cause intermittant problems if water/crap gets inside the protective boot around the sender. Fuel inlet hose into the fuel injection pump has a sintered bronze filter in-line. This can clog up and cause lack of power/failure to rev over 1500rpm/surging problems. Other than this, it is a bomb proof engine. I ran a brand new MK (1985 turbo) from Melb to Brisbane in summer, fully laden, air con all the way, sat on 120kph and it still returned 29 mpg!

Thanks Desert, some very helpfull info..