uhh.... posted by jezebel on May 24, 2001 at 06:28 PM
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It recommends a GL-4 or GL-5 for all Nissan manual transmissions. We know that GL-5 can damage certain types of synchros. Someone posted once that Nissan doesn't use those synchros and GL-5 will not damage Nissan synchros. How GL-5 affects gear grinding is another story. One of the Nissan recommended products for both tranny and diff is Castrol Hypoid "C" or equivalent.
BTW motor oils have improved tremendously since our cars were built. The 1990 5W30 and 10W30 are not the same oils you buy today. Soon API service SJ is scheduled to be replaced by yet another improved oil.