Is there a difference between 84-86, (87) and 88-89 engines? I was told that there was a slight different in the engine when Nissan made the 87. I can’t remember what was said to me .The reason why I’m asking the question, the timing belt broke and I’m replacing it. Also, I was told to check to see if any anti-freeze was in the oil, but did not see any. I’m trying to figure out the best route of fixing the problem and how much damage has this cause.