Transmission Lubricants Technical Committee

Work in progress

CTLT has currently 5 active groups

• GT1 – Tests for lubricating greases – A. Lopez (Shell Global solutions SA)
• GT2 – Oxidation stability of transmission lubricants – J. Obiols (Total)
• GT3 – 4 Ball Lubricant tester – Surveillance group – new organisation in 2003
• GT8 – SAEII wet clutch friction – Surveillance group – A. Bouffet (ETSm)
• GT9 – Brookfield viscosity of transmission lubricants – M. Maillard (Total)

Passed activities (work completed)

• Gear efficiency
• Foaming/air entrainment in transmission fluids
• Transmission noise
• Limited slip differential shudder
• Synchronisation ring wear
• Pitting and gear fatigue
• Grease for centralised systems in heavy duty vehicles
• Biodegradability of automotive lubricants
• Oxidation stability: GFC work was later used in CEC PT-048 group to develop a CEC method.
• Elastomer compatibility

6 methods have been submitted by GFC groups as official standards under BNPé or AFNOR control

• Oxidation stability of lubricating oils used in automotive transmissions by artificial ageing
• Insoluble content of lubricants after oxidation by artificial ageing
• Grease
  • cone penetrations and water resistance
  • ability to prevent false Brinelling
• Biodegradability
• 4 Ball Lubricant testing