We do have some decent long term testing on the Delvac 1, for what it's worth, with the aircooled guys. Many tranny rebuilders, including Guard, recommend it.
Amsoil also makes a GL4 oil, that I used to use in 356 and VW gearboxes before switching to Swepco 201, which anyone before a 915 gearbox swears buy. It's also a GL5 rated oil, for what it's worth.
Interesting you mention Nissans - one of my customers mentioned their use of Motul in their race trannies (and engines) with excellent results.
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Charles Navarro
President, LN Engineering and Bilt Racing Service
http://www.LNengineering.com
Home of Nickies, IMS Retrofit, and IMS Solution
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