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#4626368 - 01/06/18 08:22 PM 8.1 Chevy 0w40
chilson450 Offline


Registered: 03/30/16
Posts: 20
Loc: 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.
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2001 Chevrolet 2500hd 8.1/Allison
2011 Ford Explorer 3.5

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#4626373 - 01/06/18 08:32 PM Re: 8.1 Chevy 0w40 [Re: chilson450]
car51 Offline


Registered: 03/12/15
Posts: 10252
Loc: Southwest PA
Since you have a gas engine, yes they would be fine to use smile
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#4626480 - 01/06/18 10:46 PM Re: 8.1 Chevy 0w40 [Re: chilson450]
BrocLuno Offline


Registered: 09/06/15
Posts: 5512
Loc: 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).
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Formerly in marine engineering. In an earlier life I owned my own petroleum tank truck, and hauled for the majors and independent's.

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#4626691 - 01/07/18 08:51 AM Re: 8.1 Chevy 0w40 [Re: BrocLuno]
Kira Online   content


Registered: 08/19/10
Posts: 5214
Loc: Champlain/Hudson Valley
FOI (For OUR Information): How many qts. of oil does the 8.1's belly hold?

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#4626715 - 01/07/18 09:24 AM Re: 8.1 Chevy 0w40 [Re: Kira]
daman Offline


Registered: 09/23/06
Posts: 11136
Loc: 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
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"Always"....Mobil 1

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#4626783 - 01/07/18 10:53 AM Re: 8.1 Chevy 0w40 [Re: chilson450]
Linctex Offline


Registered: 12/31/16
Posts: 6148
Loc: 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
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(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."

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#4634489 - 01/14/18 10:44 AM Re: 8.1 Chevy 0w40 [Re: chilson450]
wtd Offline


Registered: 06/25/02
Posts: 1915
Loc: 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.
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