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Wepeel · 07-29-2014, 10:49 AM

Which specific Amsoil? It looks like the Amsoil 75w90s are only GL-5 - they say it can be used in rear axles that require GL4 but that's probably because axles don't have synchros.

07-29-2014, 10:49 AM	#2
Wepeel Senior Member Join Date: May 2012 Drives: '13 BRZ Ltd Location: PA Posts: 458 Thanks: 265 Thanked 229 Times in 117 Posts Mentioned: 8 Post(s) Tagged: 0 Thread(s)	Which specific Amsoil? It looks like the Amsoil 75w90s are only GL-5 - they say it can be used in rear axles that require GL4 but that's probably because axles don't have synchros.