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  1. Path: sparky!uunet!charon.amdahl.com!pacbell.com!sgiblab!sdd.hp.com!wupost!emory!ogicse!sequent!muncher.sequent.com!troy
  2. From: troy@sequent.com (Troy Wecker)
  3. Newsgroups: rec.autos.tech
  4. Subject: GEAR LUBE (WAS GL-4 QUESTION)
  5. Message-ID: <1992Nov17.183823.22800@sequent.com>
  6. Date: 17 Nov 92 18:38:23 GMT
  7. Article-I.D.: sequent.1992Nov17.183823.22800
  8. Sender: usenet@sequent.com (usenet )
  9. Distribution: na
  10. Organization: Sequent Computer Systems, Inc.
  11. Lines: 60
  12. Nntp-Posting-Host: crg1.sequent.com
  13.  
  14.  
  15.  
  16. Finally I can answer a question instead of ask one :-).  Here is the
  17. description for gear oils from  Automotive Engineering Magazine (SAE),
  18. August 1985, p62.  There was also a chart showing the viscosity
  19. comparison between SAE Viscosity and SAE "Gear" Viscosity.
  20.  
  21. SAE Viscosity   SAE "Gear" Viscosity
  22. -------------   --------------------
  23.  40-50              90
  24.  30                 85
  25.  20                 80
  26.  10                 75
  27.  
  28. Note:  Values above are approx.  I didn't want to draw the scales.
  29.  
  30.  
  31.                 API Service Classifications
  32.                 ===========================
  33.  
  34. Classification          Type                    Typical Application
  35. --------------          ----                    -------------------
  36.  
  37.      GL-1        Straight Mineral oil           Automotive manual
  38.                                                 transmissions
  39.  
  40.      GL-2        Usually contains fatty         Worm gear drives.
  41.                  materials                      Industrial gear oils
  42.  
  43.      GL-3        Contain mild EP additives      Manual transmissions
  44.                                                 and spiral bevel
  45.                                                 final drives (GL-3 not
  46.                                                 widely used).
  47.  
  48.      GL-4        Equivalent to obsolete MIL-    Manual transmissions,
  49.                  -L-2105 Specs.  Usually        spiral bevel and
  50.                  satisfied by 50% GL-5          hypoid gears where
  51.                  additive level.                moderate service
  52.                                                 prevails.
  53.  
  54.      GL-5        Equivalent to present MIL-     Used for Moderate and
  55.                  -L-2105C specs. Primary        severe service in
  56.                  field service recommendation   hypoid and all other
  57.                  of most passenger car and      types of gears.  Also
  58.                  truck builders worldwide.      may be used in manual
  59.                                                 transmissions.
  60.  
  61.      GL-6        Technically obsolete.          Typically recommended
  62.                  Same as Ford M2C105A           in service conditions
  63.                  (Still in use for Ford         where more antiscoring
  64.                  light trucks)                  protection than
  65.                                                 provided by GL-5 lube
  66.                                                 is required.
  67.  
  68.  
  69.  
  70. Troy Wecker
  71. troy@sequent.com
  72. Sequent Computer Systems
  73. Beaverton, OR
  74.