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Oil Weight for 7.3 psd in Arizona #4977181
01/12/19 03:49 PM
01/12/19 03:49 PM
Joined: Jan 2019
Posts: 3
AZ
SacAttack97 Offline OP
SacAttack97  Offline OP
Joined: Jan 2019
Posts: 3
AZ
Was curious if running 10w30 or 5w40 synthetic oils in 7.3 psd would be alright year round in southern arizona?

Re: Oil Weight for 7.3 psd in Arizona [Re: SacAttack97] #4977182
01/12/19 03:52 PM
01/12/19 03:52 PM
Joined: Oct 2009
Posts: 3,702
Wet side WA
JohnnyJohnson Offline
JohnnyJohnson  Offline
Joined: Oct 2009
Posts: 3,702
Wet side WA
I would run the 5w-40 all year it won't matter if your in the desert or up in the high desert in the winter.


2004 Corolla 128335
Out: VML 5w-30 TG4967 OCI 5007 Miles
In: EDGE EP 5W-30 Bosch 3311 122537 7-18-18
2006 Duramax 74615
Out: T6 5W-40 M1-303
In: T6 5W-40 XG9100 73705 4-22-18
Re: Oil Weight for 7.3 psd in Arizona [Re: SacAttack97] #4977186
01/12/19 03:56 PM
01/12/19 03:56 PM
Joined: Aug 2003
Posts: 13,234
NE,Ohio
Rand Offline
Rand  Offline
Joined: Aug 2003
Posts: 13,234
NE,Ohio
if you go below 20F I'd stick with a 5w40

if temps never go below 20f a 15w40 would be fine.(or for warm season)


2019 Jeep Cherokee Trailhawk 2.0T
Re: Oil Weight for 7.3 psd in Arizona [Re: SacAttack97] #4977195
01/12/19 04:07 PM
01/12/19 04:07 PM
Joined: Oct 2004
Posts: 3,215
Midwest, Illinois
beanoil Offline
beanoil  Offline
Joined: Oct 2004
Posts: 3,215
Midwest, Illinois
In Arizona, 15w40 full time.


beanoil: Tough under heat, real dirty afterwards.
Re: Oil Weight for 7.3 psd in Arizona [Re: SacAttack97] #4977203
01/12/19 04:16 PM
01/12/19 04:16 PM
Joined: Oct 2010
Posts: 7,140
Michigan
A_Harman Offline
A_Harman  Offline
Joined: Oct 2010
Posts: 7,140
Michigan
Yes, 15w40 all the time.


1985 Z51 Corvette track car
2002 Camaro Z28 LS1/6-speed
2001 Dodge Ram 2500 diesel
1972 GMC 1500 shortbed project truck
Re: Oil Weight for 7.3 psd in Arizona [Re: beanoil] #4977227
01/12/19 04:53 PM
01/12/19 04:53 PM
Joined: Jun 2003
Posts: 18,056
Deplorable in apple valley, ca
Chris142 Offline
Chris142  Offline
Joined: Jun 2003
Posts: 18,056
Deplorable in apple valley, ca
Originally Posted by beanoil
In Arizona, 15w40 full time.

Some places like flagstaff do get very cold. Above about 25f 15w40 would be good. Below that a 5w40.


02 Wrangler carlube 5w30
87 F250 traveler 15w40
07 fjcruiser Chevron 10w30
Z400 castrol T 10w40
Can am maveric edge 5w40
57 case tractor 15w40
Re: Oil Weight for 7.3 psd in Arizona [Re: Chris142] #4977456
01/12/19 09:02 PM
01/12/19 09:02 PM
Joined: Oct 2014
Posts: 12,748
Canyon County Idaho
CT8 Online content
CT8  Online Content
Joined: Oct 2014
Posts: 12,748
Canyon County Idaho
Originally Posted by Chris142
Originally Posted by beanoil
In Arizona, 15w40 full time.

Some places like flagstaff do get very cold. Above about 25f 15w40 would be good. Below that a 5w40.

+1


2015 Ford F150 2.7
2018 Ford F350 6.2
Re: Oil Weight for 7.3 psd in Arizona [Re: Chris142] #4977615
01/13/19 01:41 AM
01/13/19 01:41 AM
Joined: Dec 2009
Posts: 26,367
Regina, Saskatchewan, Canada
Garak Offline
Garak  Offline
Joined: Dec 2009
Posts: 26,367
Regina, Saskatchewan, Canada
While each engine has its quirks, a 15w-XX is good to -20 C or so. Now, whether or not I'd try to start a diesel in conditions like that without it being plugged in is another matter altogether.


Plain, simple Garak.

2008 Infiniti G37 - Shell ROTELLA T6 Multi-Vehicle 5w-30, NAPA Gold 7356
1984 F-150 4.9L - Quaker State GB 10w-30, Wix 51515
Re: Oil Weight for 7.3 psd in Arizona [Re: SacAttack97] #4977684
01/13/19 06:30 AM
01/13/19 06:30 AM
Joined: May 2007
Posts: 7,721
Indianapolis, IN
dnewton3 Offline
dnewton3  Offline
Joined: May 2007
Posts: 7,721
Indianapolis, IN
Both 10w-30 and 15w-40 would work well. You're not going to see any wear control differences between those two choices.
No need for a syn in AZ, especially southern AZ. Those whom are suggesting that are just wasting our money.


The act of preventative maintenance, in and of itself, is FAR MORE important than brand/grade/base choices among lubes and filters.
- under maintaining something is akin to abuse/neglect; that can kill equipment by shortening the lifespan
- over maintaining something has never been proven to be anything but a waste of time and money
Re: Oil Weight for 7.3 psd in Arizona [Re: SacAttack97] #4978092
01/13/19 03:41 PM
01/13/19 03:41 PM
Joined: Jan 2019
Posts: 3
AZ
SacAttack97 Offline OP
SacAttack97  Offline OP
Joined: Jan 2019
Posts: 3
AZ
If i wanted to run extended oci would it be good to run a synthetic? Right now i run rotella t4 at 5000 mile intervals.

Re: Oil Weight for 7.3 psd in Arizona [Re: SacAttack97] #4978632
01/14/19 05:27 AM
01/14/19 05:27 AM
Joined: May 2007
Posts: 7,721
Indianapolis, IN
dnewton3 Offline
dnewton3  Offline
Joined: May 2007
Posts: 7,721
Indianapolis, IN
There are two good reasons to run syns:
1) uber stupid cold temps (not likely in your area)
2) really long OCIs (often best paired with BP filtration as well)

Why not run a few UOAs with the dino lube at 5k mile intervals?; establish some baseline data. Then swap to a syn of your choice and see if you're getting 2x or 3x more of something in return for the money spent.


The act of preventative maintenance, in and of itself, is FAR MORE important than brand/grade/base choices among lubes and filters.
- under maintaining something is akin to abuse/neglect; that can kill equipment by shortening the lifespan
- over maintaining something has never been proven to be anything but a waste of time and money
Re: Oil Weight for 7.3 psd in Arizona [Re: SacAttack97] #4978660
01/14/19 06:46 AM
01/14/19 06:46 AM
Joined: Jan 2019
Posts: 3
AZ
SacAttack97 Offline OP
SacAttack97  Offline OP
Joined: Jan 2019
Posts: 3
AZ
Thank you very much for the pointers i just got a oil analysis kit from blackstone so i can send a sample ill post the results when i get them.

Re: Oil Weight for 7.3 psd in Arizona [Re: SacAttack97] #4980847
01/16/19 08:37 AM
01/16/19 08:37 AM
Joined: Feb 2008
Posts: 480
The American West
bbslider001 Offline
bbslider001  Offline
Joined: Feb 2008
Posts: 480
The American West
I do not recommend longer OCIs with the 7.3 just due to how our injection systems are designed. Save yourself the time and money and continue with a proven dino oil at 5k OCIs and forget about it. I run Walmart Supertech 15w-40. It has provided two very good UOAs for me under severe conditions.


Byron

1999 F-350 CCLB SRW 7.3, Supertech 15w-40 protected, 300k miles
1997 F-350 CCLB DRW 7.3, SOLD
2015 Kia Soul Plus




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