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#4785066 - 06/12/18 05:12 PM 67-81 GM viscosity chart
jakewells Offline


Registered: 12/28/12
Posts: 540
Loc: Cave City KY
I found this in a book for engines covered from 1967 through 1981 and i thought it was interesting that 5w20 was covered in it.
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1978 Chevy Nova 250 I6 3 on the tree.
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#4785074 - 06/12/18 05:18 PM Re: 67-81 GM viscosity chart [Re: jakewells]
maxdustington Online   content


Registered: 01/21/17
Posts: 1052
Loc: Toronna
SAE 30 above 5 celsius good to know, you can use SAE 30 for most of the year.

5W20 is odd but I think SAE 10 is even more strange. You could run straight grades year round if you wanted to throughout the 70s apparently.


Edited by maxdustington (06/12/18 05:19 PM)
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#4785077 - 06/12/18 05:18 PM Re: 67-81 GM viscosity chart [Re: jakewells]
carviewsonic Offline


Registered: 08/17/16
Posts: 235
Loc: Alberta
When was the book published?
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#4785081 - 06/12/18 05:22 PM Re: 67-81 GM viscosity chart [Re: carviewsonic]
jakewells Offline


Registered: 12/28/12
Posts: 540
Loc: Cave City KY
Originally Posted By: carviewsonic
When was the book published?

The copyright says 1981 it sure does provide some good reading this book covers camaro's but my friend said a lot of the info applies to my nova as well.
Here is the oil change recommendation as well.
_________________________
1994 Ford F150 302 4R70
Chevron Delo SAE 30 CF/SL Fram XG8A
1978 Chevy Nova 250 I6 3 on the tree.
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#4785082 - 06/12/18 05:24 PM Re: 67-81 GM viscosity chart [Re: jakewells]
JLTD Offline


Registered: 12/15/17
Posts: 937
Loc: US
Thanks for the chart! Interesting to see considering oils have changed so much since '81.
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#4785086 - 06/12/18 05:26 PM Re: 67-81 GM viscosity chart [Re: jakewells]
jhellwig Offline


Registered: 07/01/13
Posts: 1599
Loc: Ottumwa, Iowa
I am fairly sure the owners manual from my 1983 k5 has 20w-20 on the chart. I donít remember what else is in there.
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#4785088 - 06/12/18 05:28 PM Re: 67-81 GM viscosity chart [Re: maxdustington]
jhellwig Offline


Registered: 07/01/13
Posts: 1599
Loc: Ottumwa, Iowa
Originally Posted By: maxdustington
SAE 30 above 5 celsius good to know, you can use SAE 30 for most of the year.

5W20 is odd but I think SAE 10 is even more strange. You could run straight grades year round if you wanted to throughout the 70s apparently.


It is 10w not sae 10. Two different things. Donít ask me what it is but I just know itís different.
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#4785090 - 06/12/18 05:29 PM Re: 67-81 GM viscosity chart [Re: jakewells]
carviewsonic Offline


Registered: 08/17/16
Posts: 235
Loc: Alberta
I hadn't heard of 5w-20 back then, maybe in the late nineties(?). Then again, I had only been driving for a year or so in 1981.
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#4785092 - 06/12/18 05:32 PM Re: 67-81 GM viscosity chart [Re: jhellwig]
maxdustington Online   content


Registered: 01/21/17
Posts: 1052
Loc: Toronna
Originally Posted By: jhellwig
It is 10w not sae 10. Two different things. Donít ask me what it is but I just know itís different.

The plot thickens!

7500 miles or a year is a long OCI for 1981, 3K OCIs are complete marketing. The truth comes out!
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#4785096 - 06/12/18 05:35 PM Re: 67-81 GM viscosity chart [Re: jakewells]
Dave1027 Offline


Registered: 05/02/18
Posts: 80
Loc: California
I think it's odd that they have 10w30 going past 100 degrees F but 5w30 only goes to 60 degrees? The first number is for cold engine. At operating temps, both oils are 30 weights.

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#4785097 - 06/12/18 05:35 PM Re: 67-81 GM viscosity chart [Re: jakewells]
Astro_Guy Offline


Registered: 07/30/15
Posts: 471
Loc: Pennsylvania
Thanks for sharing. I remember 20w40 and contemplated using it. I cannot say I recall ever seeing 10w.

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#4785098 - 06/12/18 05:38 PM Re: 67-81 GM viscosity chart [Re: jakewells]
Warstud Offline


Registered: 09/02/05
Posts: 5585
Loc: MIchigan
What the heck is a 20w20?

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#4785104 - 06/12/18 05:43 PM Re: 67-81 GM viscosity chart [Re: jakewells]
69Torino Offline


Registered: 12/12/17
Posts: 322
Loc: Indy
Proof that 5w-20 is the work of the Devil! Just kidding. Itís fine for grandma.
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#4785110 - 06/12/18 05:46 PM Re: 67-81 GM viscosity chart [Re: jakewells]
bullwinkle Offline


Registered: 10/09/04
Posts: 7835
Loc: Cincinnati, OH, USA
Remember these were the days of sludge caused by sheared VIIs-those days are over. I'm sure that's part of the reason for no sustained high speeds with 5W20.
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#4785113 - 06/12/18 05:48 PM Re: 67-81 GM viscosity chart [Re: carviewsonic]
tig1 Offline


Registered: 01/03/09
Posts: 13763
Loc: Illinois
Originally Posted By: carviewsonic
I hadn't heard of 5w-20 back then, maybe in the late nineties(?). Then again, I had only been driving for a year or so in 1981.


I started using M1 5-20 in 1978 in a Dodge Slant 6. Kept my engine very clean.


Edited by tig1 (06/12/18 05:49 PM)
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