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Click on image for the lowdown. 
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| | | Forums66 Topics128,073 Posts1,055,908 Members48,429 | | Most Online14,466
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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For helping keep this great
old truck web site
on the Internet for over 30 years! and not clogged down
with Ads!  Again, thanks!
| | | | Joined: Jul 2009 Posts: 23 Wrench Fetcher | | Wrench Fetcher Joined: Jul 2009 Posts: 23 | As Workmaster says, 80/90 works for both. Fill till it starts to run out of the fill hole. If you go with synthetic, which will keep the heat down on the hot days and flow better on the cold ones, you will probably end up using a 75/90. | | |
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