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We've had a few epic technical discussions of this issue of gearbox oil.
A few of us who are fairly well educated in tribology beat it to death .We searched both in USA and Europe for an alternative. We failed. Use Search for the geekish details. If when you drain the old oil it is filthy maybe there is a case for using an inadequate alternative as a flushing oil and then replace with the correct(Shell) oil.
If you are curious about how complicated the chemistry of these oils is- visit BITOG .
After a few hours there you will wonder why people who select oil because the "like it" make a post in a thread like this.This isn't a Facebook fan page!
JFP's recommendation is what we geeks reluctantly came to accept the very best advice. This has been acknowledged many,many times. So unless you can publish a comparison of the chemistry of a new alternative oil to the Porsche-approved ,Shell product ,nothing has changed. Substitutes may work well enough(?) but that is a pragmatic question, not a technical one.
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