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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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| | | | Joined: May 2007 Posts: 292 Wrench Fetcher | | Wrench Fetcher Joined: May 2007 Posts: 292 | gas engine V-6,I-6, or V-8 should run 20w-50 in the summer heat and 10W-40 in the cold of winter. . . . i use AMSOIL synthetic's in my old stuff i use straight 60 in the sumer and 20w-50 in the winter synthetic run thin. . . .
in standard oil i run 20w-50 summer 10w-40 winter i haven't had a problem yet. . .
now some say it affect's gas milage not so i got a 95 f-150 with 351efi V-8 it get's 13mpg with 10w-30 mobile one still got 13mpg when i put in 20w-50 amsoil. . . but i gained some oil pressure only difference i noticed. . .
1962 GMC K3000, GMC-379 V6.
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