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8.1 Chevy 0w40 #4626368
01/06/18 08:22 PM
01/06/18 08:22 PM
Joined: Mar 2016
Posts: 21
Northern Michigan
chilson450 Offline OP
chilson450  Offline OP
Joined: Mar 2016
Posts: 21
Northern Michigan
I picked up 30 quarts of the Autozone clearance Mobil 1 HM 10w40. Also some Castrol HM 10w40. I think these will be ok in the 8.1 big block besides winter time. After i use these up will 0w40 cause more consumption? It has 140k miles and these engines are known oil burners anyways. I'm in northern Michigan so winters are cold. Thanks for any opinions.


2008 Chevy 2500hd 6.0
2011 Ford Explorer 3.5
Re: 8.1 Chevy 0w40 [Re: chilson450] #4626373
01/06/18 08:32 PM
01/06/18 08:32 PM
Joined: Mar 2015
Posts: 11,878
In the shop
53' Stude Offline
53' Stude  Offline
Joined: Mar 2015
Posts: 11,878
In the shop
Since you have a gas engine, yes they would be fine to use smile


09' Camry LE, 141,020 miles

PP 5w30 and TG 4967
Re: 8.1 Chevy 0w40 [Re: chilson450] #4626480
01/06/18 10:46 PM
01/06/18 10:46 PM
Joined: Sep 2015
Posts: 6,075
Kalifornia Kollective
BrocLuno Offline
BrocLuno  Offline
Joined: Sep 2015
Posts: 6,075
Kalifornia Kollective
I would not worry about any of that. The big blocks like a bit thicker oil (your 40 at op temp is great).


Formerly in marine engineering. In an earlier life I owned my own petroleum tank truck, and hauled for the majors and independent's.
Re: 8.1 Chevy 0w40 [Re: BrocLuno] #4626691
01/07/18 08:51 AM
01/07/18 08:51 AM
Joined: Aug 2010
Posts: 5,940
Champlain/Hudson Valley
Kira Offline
Kira  Offline
Joined: Aug 2010
Posts: 5,940
Champlain/Hudson Valley
FOI (For OUR Information): How many qts. of oil does the 8.1's belly hold?

Re: 8.1 Chevy 0w40 [Re: Kira] #4626715
01/07/18 09:24 AM
01/07/18 09:24 AM
Joined: Sep 2006
Posts: 11,154
Bad Axe, MI
daman Offline
daman  Offline
Joined: Sep 2006
Posts: 11,154
Bad Axe, MI
Originally Posted By: Kira
FOI (For OUR Information): How many qts. of oil does the 8.1's belly hold?

7

OP you'll be fine to use the 0w40, I've used that and 0w30 in my 7.4 3500


"Always"....Mobil 1

Current fill: AFE 0w30
Re: 8.1 Chevy 0w40 [Re: chilson450] #4626783
01/07/18 10:53 AM
01/07/18 10:53 AM
Joined: Dec 2016
Posts: 7,162
Waco, TX
Linctex Offline
Linctex  Offline
Joined: Dec 2016
Posts: 7,162
Waco, TX
284,000 miles on my 7.4 (454) ... run on pretty much the least expensive 15W-40 money can buy all its life.

Back in the 70's and 80's we didn't have 5W-30 for the winter, 10W-30 was usually it.
North Dakota winters are just as cold as Northern Michigan smile


"The evidence demands a verdict".
(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."
Re: 8.1 Chevy 0w40 [Re: chilson450] #4634489
01/14/18 10:44 AM
01/14/18 10:44 AM
Joined: Jun 2002
Posts: 2,042
southwest Mo.
wtd Offline
wtd  Offline
Joined: Jun 2002
Posts: 2,042
southwest Mo.
I'm running 10W-40 Castrol HM in my 1998 7.4L. With this colder weather I do get some tapping on startup and it doesn't start as quick but once it warms up, it's fine.


2014 Mustang GT
1998 Chevy K3500
1998 Chevy K1500
(2) 1992 Cavaliers
1970 Monte Carlo

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