Quote:
Originally Posted by Ralph Spoilsport
GL-5 isn't "better" than GL-4, it's different. Significantly, it's different in a way that can lead to poor synchronizer performance.
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Subaru recommends using Subaru Extra-S 75W90 fluid in the BRZ. It is a synthetic GL-5 gear oil, same as specified for the STI transmissions. Both transmissions use brass synchronizers...as do most. Never seen one that suffered from corroded synchronizers.
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2020 GMC Canyon Denali Duramax, 2021 Forester Sport, 2000 Subaru Legacy B4 RSK 5MT (JDM Import) and random 86 chassis rebuilds....