Recent Topics
Pentosin Mania
by Snagglefoot - 07/01/20 11:30 PM
Spills. Synthetic vs petrolium
by Chris142 - 07/01/20 10:35 PM
Michelin Pilot Sport All-Season 4
by FordFocus - 07/01/20 10:04 PM
NGK Ruthenium Spark Plugs
by Deontologist - 07/01/20 07:49 PM
Ram Truck Speaker Upgrade Questions
by edhackett - 07/01/20 07:41 PM
OLM SCREWED UP
by demarpaint - 07/01/20 06:12 PM
Have Valvoline European 5w-40. Use in Cummins?
by RetiredGuyOR - 07/01/20 06:06 PM
Change in evaporation rate over time?
by mosschops - 07/01/20 05:56 PM
17 Golf overzealous OLM/Minder
by lawrencerd - 07/01/20 04:24 PM
First cell phone
by Chris142 - 07/01/20 04:08 PM
Motorcraft FL836 Specifications
by viscous - 07/01/20 03:41 PM
Chipmunks - Damit.
by PontiacHO - 07/01/20 03:37 PM
27/18k portable genset oil.
by 1978elcamino - 07/01/20 03:31 PM
Saw a new BMW and had to do a double take.
by wemay - 07/01/20 02:55 PM
Seems like there is less activity on BITOG
by SLO_Town - 07/01/20 02:21 PM
Rock Auto horrible customer service
by cknight49090 - 07/01/20 02:09 PM
Mobil 1 rebate hassle
by cknight49090 - 07/01/20 02:00 PM
Newest Members
RetiredGuyOR, BretBouer, JKMark, Tugcan, George_Robert
71821 Registered Users
Who's Online Now
18 registered members (CARJ, blufeb95, Bailes1992, ctechbob, Danno, Brynjaminjones, 1 invisible), 653 guests, and 39 spiders.
Key: Admin, Global Mod, Mod
Forum Statistics
Forums67
Topics307,388
Posts5,309,617
Members71,821
Most Online4,538
Jan 20th, 2020
Donate to BITOG
Print Thread
Hop To
update to papers #5454564 06/15/20 04:21 PM
Joined: May 2002
Posts: 3,307
W
widman Offline OP
OP Offline
W
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
O
OilUzer Offline
Offline
O
Joined: Jul 2017
Posts: 1,519
I read part of diff between gl-4 and gl-5 ... Very informative!
Thanks

Re: update to papers [Re: widman] #5454822 06/15/20 09:47 PM
Joined: Feb 2009
Posts: 18,037
D
daves87rs Offline
Offline
D
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
Global Moderator
Offline
Global Moderator
Joined: Jun 2002
Posts: 21,215
I don't think I would make sweeping generalizations such as this one:

Quote
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.
Previous Thread
Index
Next Thread

BOB IS THE OIL GUY® Powered by UBB.threads™