These guys make GRP V Synthetic oils and gearlubes. Top Drawer stuff!!

http://www.neosyntheticoil.com/gear_oil.html

Another extremely great product. All Motul synthetics are double ester GRP V bases. The best of the best.

http://www.motorspotstore.com/gearcomp75w140.html

This 75w-140 works fine in Bravo's as it is a double ester that remains at 75W unless it's heated up to extreme temps. Very unusual feaures in this product.

All I can say about "doing as good or worse in their studies?" is if the test was biased, they would be number 1 in every category. Also, I would like to see another company compare themselves to AMSOIL. You never see Mobil compare themselves to them. They always compare themselves against the Pennzoils, Castrols and whatnot. Royal Purple is garbage. Its not half the product it used to be ten years ago or so. Motul is typically a really good product, however, for at least twice the cost, its not that much better.

I've been running Royal Purple gear lube because of recommendations from people setting up drives on this forum. Is it really garbage? And, if so compare directly to amsoil or Mobil 1.

Actually yes, often on individual tests the Amsoil test data posted for their product is not as good as some of the compettive products or is equal to them. On their summation of all tests / overall rating Amsoil is always #1 as you say.

http://www.amsoil.com/products/gearl...hitePaper.aspx

I was particularly interested to see that the Red Line 75W-90 was quite a bit better than the Amsoil Severe Gear Lube in the ASTM D-3233 Falex Extreme Pressure Test and that was not even the Red Line Shock Proof Gear Lube which according to Red Line's ASTM D-2596 heavy load test data has roughly half the wear of the basic Red Line. The Torco SGO Synthetic results on the ASTM-3233 test was also better than the Amsoil.

Of the ASTM test protcols that Amsoil used, which (if any) would you consider useful and which would you not in evaluating a drive oil's merits?

Consider the source relative to the overall conclusion but it is comprised of lubricant test results per individual ASTM test procedures (that the lubrication industry has designed and ASTM
http://www.astm.org/ABOUT/aboutASTM.html
has approved for release as an ASTM procedure).

http://www.amsoil.com/products/gearl...hitePaper.aspx

Hydrocruiser,

Anything about these guys?
http://www.le-inc.com/

A GL-6 rating is no longer recognized by the API.
The most prevelant gear lubr rating currently is GL-5.

The GL-6 rating has been out of vouge for maybe 20 years or so.

Ken

A 75w-140 is a multi viscosity, just like a 80w90 or a 10w40 engine oil.

All multi viscosity oils act like the lower number(only in cold weather tests, the "W" means winter) and will THIN to a viscosity which equates to the higher number at 210*F.

210* is the most extreme temp the API tests and qualifies oil at.

Ken

Do you know anyone who runs this oil in a Bravo drive?

The Motul 300v series that you state are great are ALL 'catalytic converter' recommended, including there motor cycle oil, does that mean there is a low ZDDP content?