So it was a d22 model which you had, which had the engine problems normally blowing piston out on no3 and 4 cyclinders. Normally down to poor servicing causing the under piston oil galleries to block causing the engine to throw the rods. I must have rebuilt 10 of them engines in mine time with nissan, normal mileage range was 50k to 90k. Service time was 6 months or 6k miles was it a known area of concern maybe???? I worked on the nissan brand for near on 6yrs main dealer and the d22 was better than the d40 which is now made.