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


Registered: 12/28/12
Posts: 457
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.
_________________________
1994 Ford F150 302 4R70
Chevron Delo SAE 30 CF/SL Fram XG8A
1978 Chevy Nova 250 I6 3 on the tree.
Rotella 10W40 Fram TG30


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#4785074 - 06/12/18 05:18 PM Re: 67-81 GM viscosity chart [Re: jakewells]
maxdustington Offline


Registered: 01/21/17
Posts: 628
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)
_________________________
03 Jetta AWP/09A 200k kms
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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: 217
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 Online   content


Registered: 12/28/12
Posts: 457
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.
Rotella 10W40 Fram TG30


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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: 644
Loc: US
Thanks for the chart! Interesting to see considering oils have changed so much since '81.
_________________________
His: 2015 4Runner SR5 1GR-FE 37k, Amsoil OE 5w20/Wix
Testing vs Amsoil OE 5w30...then longer OCI on SS

Hers: 2008 Jeep Liberty 134k, Amsoil SS 5w30/Amsoil, minimum 10k oci

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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: 1539
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.
_________________________
Sparks fly from my fingers.

1995 Chevy K2500 Suburban lt 5.7
2008 Chevy Suburban 5.3
1983 Chevy K5 350

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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: 1539
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.
_________________________
Sparks fly from my fingers.

1995 Chevy K2500 Suburban lt 5.7
2008 Chevy Suburban 5.3
1983 Chevy K5 350

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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: 217
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 Offline


Registered: 01/21/17
Posts: 628
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!
_________________________
03 Jetta AWP/09A 200k kms
TGMO 0W20 "Legend" & Hella Magnet Filter

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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: 39
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: 444
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: 5390
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: 235
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: 7659
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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06 Ram 3500 CTD 4X4(FG Venturi), 93 GMC C3500 6.2, 89 F-450 7.3, 98 XJ 4.0(XG8A), 05 xB(XG3600), 15 Transit 3.7, 03 Merc Grand Marquis 4.6 2V(XG2)

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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: 13657
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)
_________________________
2007 Ford Fusion 227,000 miles
M1 0-20 EP
2017 Ford Fusion 49K
M1 0-20 EP
10,000 mile OCIs on both engines
M1 ATF and MC LV
M1 10-30 in all OPE
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