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30W or 40W ? #5213794 09/15/19 09:00 PM
Joined: Sep 2011
Posts: 469
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lukejo Offline OP
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Posts: 469
‘09 Chevy 2500HD 6.0 gas.
100,000 miles, doesn’t use any oil.
It has always had 5w-30.
However, 95% of miles are now going to be used for light towing (3,000 lbs).
Stick with 5w30 or move to a 40w?

Re: 30W or 40W ? [Re: lukejo] #5213809 09/15/19 09:11 PM
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Jimmy_Russells Online Content
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Rotella 5w30 MV

Re: 30W or 40W ? [Re: lukejo] #5213813 09/15/19 09:14 PM
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addyguy Offline
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+1.


2010 Kia Soul 2U - 2.0L I-4, auto; 146k miles.
Castrol GTX HM 5W-30, STP blue bottle; Fram TG 9688.

2009 Pontiac G5 - 2.2 I-4, auto, 121k miles.
Oil/filter TBD
Re: 30W or 40W ? [Re: lukejo] #5213876 09/15/19 10:38 PM
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Rolla07 Offline
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3000lbs with that?..keep doing 5w30


2007 Corolla Red Pearl 155k miles
PP 0w20 & ST 4967
2015 Toyota Venza Parisian Blue Pearl 25k miles
TGMO 0W20 & OEM filter

Re: 30W or 40W ? [Re: lukejo] #5213882 09/15/19 10:47 PM
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Newman88 Offline
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With a good synthetic you can even do 8k intervals with that load. I know because our GM work trucks with the same engine go 8k with a [censored] of alot more weight and UOA had always come looking good at that interval, the guys at BS even said to go for 10k OCI.

Re: 30W or 40W ? [Re: lukejo] #5213904 09/15/19 11:21 PM
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zrxkawboy Offline
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5W30


"Think of all the Ford owners who will someday want an automobile." John Dodge

Re: 30W or 40W ? [Re: Rolla07] #5213942 09/16/19 12:28 AM
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JLTD Offline
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Originally Posted by Rolla07
3000lbs with that?..keep doing 5w30


^


I use the overseas manual to choose my viscosity.

Using AMSOIL

Hers: 2008 Jeep Liberty 154k, SS 5w30/Amsoil

His: 2015 4Runner 60k, SS 5w20/Amsoil

Re: 30W or 40W ? [Re: lukejo] #5213991 09/16/19 04:05 AM
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Snagglefoot Offline
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For that engine, 3,000 lbs is not huge. I was towing 7,000 lbs on my 08 3/4 ton 6.0 engine, requiring 3,5000 rpm up grades. Under summer conditions ( and possibly higher oil temps) I switched to 5w40. Going back to 5w30 this fall. After 10 years of using synthetic 5w30, I’m closing in on 200,000 miles. Runs great.

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