Gear Oil choices for 1960-1966 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

AnlaufJohn · 11-30-2009, 03:13 PM

As my 1966 C-10 approaches the year-end, I will be treating it to some new transmission and differential lubricants.

The auto shops keep guiding me to the 85w-90 gear oils and I know it's been around for some time.

The factory manuals say to use 80 or 90 mineral oil, but no multi-viscosity or EP oils.

What is the consensus of this group?

I remember having to hunt down straight weight mineral oil for my Fiats back in the 80's. Do I need to find another Kendall Oil distributor?

AnlaufJohn in Springfield, Oregon

This is my truck's better side.

11-30-2009, 03:13 PM	#1
AnlaufJohn Registered User Join Date: Feb 2009 Location: Lebanon, Oregon Posts: 130	Gear Oil choices for 1960-1966 As my 1966 C-10 approaches the year-end, I will be treating it to some new transmission and differential lubricants. The auto shops keep guiding me to the 85w-90 gear oils and I know it's been around for some time. The factory manuals say to use 80 or 90 mineral oil, but no multi-viscosity or EP oils. What is the consensus of this group? I remember having to hunt down straight weight mineral oil for my Fiats back in the 80's. Do I need to find another Kendall Oil distributor? AnlaufJohn in Springfield, Oregon This is my truck's better side. Attached Images

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