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67-81 GM viscosity chart #4785066
06/12/18 04:12 PM
06/12/18 04:12 PM
Joined: Dec 2012
Posts: 562
Cave City KY
jakewells Offline OP
jakewells  Offline OP
Joined: Dec 2012
Posts: 562
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 Borg Warner T5
Rotella 10W40 Fram XG5

Re: 67-81 GM viscosity chart [Re: jakewells] #4785074
06/12/18 04:18 PM
06/12/18 04:18 PM
Joined: Jan 2017
Posts: 1,977
VW Fanboy Island
maxdustington Offline
maxdustington  Offline
Joined: Jan 2017
Posts: 1,977
VW Fanboy Island
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.

Last edited by maxdustington; 06/12/18 04:19 PM.

03 Jetta AWP/09A 205k kms
Edge 0W40 + Mann 719/30
Re: 67-81 GM viscosity chart [Re: jakewells] #4785077
06/12/18 04:18 PM
06/12/18 04:18 PM
Joined: Aug 2016
Posts: 316
Alberta
carviewsonic Offline
carviewsonic  Offline
Joined: Aug 2016
Posts: 316
Alberta
When was the book published?


'18 Impala
'05 Park Avenue
'07 Honda Accord
'09 VStar 1300
Re: 67-81 GM viscosity chart [Re: carviewsonic] #4785081
06/12/18 04:22 PM
06/12/18 04:22 PM
Joined: Dec 2012
Posts: 562
Cave City KY
jakewells Offline OP
jakewells  Offline OP
Joined: Dec 2012
Posts: 562
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 Borg Warner T5
Rotella 10W40 Fram XG5

Re: 67-81 GM viscosity chart [Re: jakewells] #4785082
06/12/18 04:24 PM
06/12/18 04:24 PM
Joined: Dec 2017
Posts: 1,310
US
JLTD Offline
JLTD  Offline
Joined: Dec 2017
Posts: 1,310
US
Thanks for the chart! Interesting to see considering oils have changed so much since '81.


I'm a thickie; assimilate
But 20s have their place

Using AMSOIL‚ĄĘ

Hers: 2008 Jeep Liberty 138k, SS 5w30/Amsoil

His: 2015 4Runner 41k, OE 5w30/Wix

Re: 67-81 GM viscosity chart [Re: jakewells] #4785086
06/12/18 04:26 PM
06/12/18 04:26 PM
Joined: Jul 2013
Posts: 1,811
Ottumwa, Iowa
jhellwig Offline
jhellwig  Offline
Joined: Jul 2013
Posts: 1,811
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
2014 Toyota Sienna
1983 Chevy K5 350
Re: 67-81 GM viscosity chart [Re: maxdustington] #4785088
06/12/18 04:28 PM
06/12/18 04:28 PM
Joined: Jul 2013
Posts: 1,811
Ottumwa, Iowa
jhellwig Offline
jhellwig  Offline
Joined: Jul 2013
Posts: 1,811
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
2014 Toyota Sienna
1983 Chevy K5 350
Re: 67-81 GM viscosity chart [Re: jakewells] #4785090
06/12/18 04:29 PM
06/12/18 04:29 PM
Joined: Aug 2016
Posts: 316
Alberta
carviewsonic Offline
carviewsonic  Offline
Joined: Aug 2016
Posts: 316
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.


'18 Impala
'05 Park Avenue
'07 Honda Accord
'09 VStar 1300
Re: 67-81 GM viscosity chart [Re: jhellwig] #4785092
06/12/18 04:32 PM
06/12/18 04:32 PM
Joined: Jan 2017
Posts: 1,977
VW Fanboy Island
maxdustington Offline
maxdustington  Offline
Joined: Jan 2017
Posts: 1,977
VW Fanboy Island
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 205k kms
Edge 0W40 + Mann 719/30
Re: 67-81 GM viscosity chart [Re: jakewells] #4785096
06/12/18 04:35 PM
06/12/18 04:35 PM
Joined: May 2018
Posts: 119
California
Dave1027 Offline
Dave1027  Offline
Joined: May 2018
Posts: 119
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.

Re: 67-81 GM viscosity chart [Re: jakewells] #4785097
06/12/18 04:35 PM
06/12/18 04:35 PM
Joined: Jul 2015
Posts: 525
Pennsylvania
Astro_Guy Offline
Astro_Guy  Offline
Joined: Jul 2015
Posts: 525
Pennsylvania
Thanks for sharing. I remember 20w40 and contemplated using it. I cannot say I recall ever seeing 10w.

Re: 67-81 GM viscosity chart [Re: jakewells] #4785098
06/12/18 04:38 PM
06/12/18 04:38 PM
Joined: Sep 2005
Posts: 5,909
MIchigan
Warstud Offline
Warstud  Offline
Joined: Sep 2005
Posts: 5,909
MIchigan
What the heck is a 20w20?

Re: 67-81 GM viscosity chart [Re: jakewells] #4785104
06/12/18 04:43 PM
06/12/18 04:43 PM
Joined: Dec 2017
Posts: 461
Indy
69Torino Offline
69Torino  Offline
Joined: Dec 2017
Posts: 461
Indy
Proof that 5w-20 is the work of the Devil! Just kidding. Itís fine for grandma.


1969 Ford Torino GT 390 Auto
2003 Mercury Marauder
1992 Mercury Capri Convertible
2005 Ford Freestyle
2008 Hyundai Santa Fe
2015 Kia Optima
1947 Ford 2N
1978 Honda XL75
Plus Other Stuff...
Re: 67-81 GM viscosity chart [Re: jakewells] #4785110
06/12/18 04:46 PM
06/12/18 04:46 PM
Joined: Oct 2004
Posts: 8,308
Cincinnati, OH, USA
bullwinkle Online confused
bullwinkle  Online Confused
Joined: Oct 2004
Posts: 8,308
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.


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), 18 Transit 3.7, 03 Merc Grand Marquis 4.6 2V(XG2)
Re: 67-81 GM viscosity chart [Re: carviewsonic] #4785113
06/12/18 04:48 PM
06/12/18 04:48 PM
Joined: Jan 2009
Posts: 13,975
Illinois
tig1 Offline
tig1  Offline
Joined: Jan 2009
Posts: 13,975
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.

Last edited by tig1; 06/12/18 04:49 PM.

2007 Ford Fusion 235,000 miles
M1 0-20 EP
2017 Ford Fusion 60K
M1 0-20 EP
10,000 mile OCIs on both engines
M1 ATF and Valvoline LV
M1 10-30 in all OPE
MC filters

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