Syn is definitely better but nothing wrong with using a good organic oil and keeping up with regularly oil changes. With 260K I redline my motor all the time without engine failure. Nissan built these motors damn good from the factory. Also if the original poster has over 200k there is a slight chance his engine is going to burn some oil causing him to spend more $ and have to add syn during the oil cycle. I add about 1.5 qts between oil changes (3500-4000k) If he wants to clean his motor then i would suggest running half to a full qt of atf fluid and run a can of seaform through the intake mani.
Even after i did a complete engine build on a fresh motor I've experience oil leaks the same day after running syn but the engine never leak a drop during the break in period running organic oil.
Even after i did a complete engine build on a fresh motor I've experience oil leaks the same day after running syn but the engine never leak a drop during the break in period running organic oil.