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update to papers #5454564 06/15/20 04:21 PM
Joined: May 2002
Posts: 3,307
widman Offline OP
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Joined: May 2002
Posts: 3,307
Many know that I published a paper on oil selection for classic, flat-tappet engines. A few know of the one on Synchronized transmissions, and fewer yet the one on selection of oil for Classic Minis.

All three have been updated, so for those who haven't seen them recently, here are the links.

Selection of oil for flat-tappet engines

Selection of oil for Classic Minis

Selection of oil for synchronized transmissions

Re: update to papers [Re: widman] #5454641 06/15/20 05:56 PM
Joined: Jul 2017
Posts: 1,519
OilUzer Offline
Joined: Jul 2017
Posts: 1,519
I read part of diff between gl-4 and gl-5 ... Very informative!

Re: update to papers [Re: widman] #5454822 06/15/20 09:47 PM
Joined: Feb 2009
Posts: 18,037
daves87rs Offline
Joined: Feb 2009
Posts: 18,037
Very good read!

2020 Chevrolet Trax LS
2019 Chevrolet Equinox LS
2006 Chevrolet Cobalt LS
2004 Chevrolet Cavalier (project)

Re: update to papers [Re: widman] #5456343 06/17/20 06:27 PM
Joined: Jun 2002
Posts: 21,215
MolaKule Offline
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Joined: Jun 2002
Posts: 21,215
I don't think I would make sweeping generalizations such as this one:

Synchromesh transmission oils
General Motors, Honda and others have developed oils that combine the best shift characteristics with
their transmission components for reduced wear. These products in general could classify as GL-4 oils if
they wanted to, but actually when we analyze their components they are very similar to 5W-30 diesel
motor oils, with a few friction modifiers added. The viscosity is closer to an ATF.
They are way too thin
for a Corvair transmission or any other where a SAE 80W-90 or 75W-90 is recommended. I will explain
the viscosity differences below. I have added the viscosity curve and characteristics to the graphs. Note:
just about any diesel motor oil can pass the GL-4 gear oil ratings.

Last edited by MolaKule; 06/17/20 06:27 PM.

"As engineers [and scientists] we are wired to solve problems and to create new things, to challenge the status quo and push the limits..." Ken Hurt, Embry-Riddle University, Class of '97.
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