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What oil should I use?

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Greg Saldaña

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Hey everyone, so still new to the k5 and Chevys for that matter. I am going to drive four hours to where the k5 is, and I am taking all of the parts I bought. I ran into a bit of a dilemma. What oil should I use for the engine. It is a 1986 k5 with the 305 (5.0) hi compression engine. I saw 5w-30 and 10w-30. How many quarts should I put in it? In the country I live in, winter isn't a thing. Most of the time it is around 35 degrees Celsius (95F). What oil should I use for the transmission? I believe it is the 700r4. Again, how many quarts? The car also has a g80, but in a pdf it said it is most likely a limited slip and not the governor. I'll leave all the questions below so they are easier to answer. Thank you for any input.

What viscosity for the engine?
How many quarts for the engine?
What viscosity for the transmission?
How many quarts for the transmission?
What should I use for the diffs?
 
I would run 15w-40 for your engine.
I’d bring 6 qts.
You want Dexron atf. 4,5 or 6 will work.
4-12qts. Depending on pan off or a dry trans.
75-80 or 90 gl5 for the diffs.
Each one holds about 3.5 qts. I think
 
Fastereddie said:
I would run 15w-40 for your engine.
I’d bring 6 qts.
You want Dexron atf. 4,5 or 6 will work.
4-12qts. Depending on pan off or a dry trans.
75-80 or 90 gl5 for the diffs.
Each one holds about 3.5 qts. I think
Click to expand...
Thanks man, I'll stock up tomorrow
 
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