IIRC from way back then, the general consensus was that the original factory fill was not ester oil (Nissan, to my knowledge, has never confirmed what they used at the factory). I believe there was a dealer bulletin from Nissan that stated that if an engine was "noisy" that the dealer should try using the Nissan's Ester Engine Oil and see if that helps to quiet the engine. That bulletin, and the general recommendation that's in the Owner's Manual to use Nissan's Ester Engine Oil is about all I know of from Nissan on the topic.
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