The Ford Barn - View Single Post

rotorwrench · 10-23-2021, 10:28 AM

GL3 was the original mild EP specification. When the API changed the specification to GL4, GL3 spec was rendered obsolete. This doesn't mean that some company can't use that spec though.

10-23-2021, 10:28 AM	#7
rotorwrench Senior Member Join Date: Jun 2010 Location: San Antonio, Texas Posts: 16,436	Re: Canadian GL4 140 gear oil GL3 was the original mild EP specification. When the API changed the specification to GL4, GL3 spec was rendered obsolete. This doesn't mean that some company can't use that spec though.