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Oil Weight for 7.3 psd in Arizona #4977181 01/12/19 04:49 PM
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SacAttack97 Offline OP
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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 04:52 PM
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JohnnyJohnson Offline
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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 135530
Out: EDGE EP 5W-30 Bosch 3311 7156 Miles
In: Havoline Pro DS 10w-30 Purolator PureOne 3-14-19 129693
2006 Duramax 76414
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 04:56 PM
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Rand Offline
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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 05:07 PM
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beanoil Offline
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In Arizona, 15w40 full time.

Re: Oil Weight for 7.3 psd in Arizona [Re: SacAttack97] #4977203 01/12/19 05:16 PM
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A_Harman Offline
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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 05:53 PM
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Chris142 Online Content
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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 Napa high milage 10w40
87 F250 Valvoline 15w40
07 fjcruiser Car lube plus 10w30
Z400 castrol T 10w40
Can am Maveric edge 5w40
57 case tractor Chevron sae30
Re: Oil Weight for 7.3 psd in Arizona [Re: Chris142] #4977456 01/12/19 10:02 PM
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CT8 Offline
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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 F150 2.7
2018 F350 6.2
Re: Oil Weight for 7.3 psd in Arizona [Re: Chris142] #4977615 01/13/19 02:41 AM
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Garak Offline
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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, Wix 57356
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 07:30 AM
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dnewton3 Offline
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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 04:41 PM
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SacAttack97 Offline OP
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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 06:27 AM
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dnewton3 Offline
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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 07:46 AM
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SacAttack97 Offline OP
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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 09:37 AM
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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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