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#31 | |
VIP Member
Join Date: Feb 2003
Location: Glendale, Arizona
Posts: 2,997
Likes: 693
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GL-5 has a higher EP (Extreme Pressure) rating than GL-4 and it offers a higher shock load protection when you have a high angle of gear contact. GL-4 gear oil, no matter the viscosity, has half of the sulfur/phosphorous additive that gives the shock load protection. Nevertheless, because of the different angle of gear contact and softer contact material, on a manual transmission, this same additive used on the GL-5 gear oil effects the syncros and other soft metal components by fretting the contact surface. |
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#32 | |
Member
Join Date: May 2014
Location: E TN
Posts: 449
Likes: 14
Liked 111 Times in 64 Posts
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