If the holy grail of diesels approves of it, it has to be good stuff. 
After all, people have bought hundreds of thousands of Dodge trucks just because of Cummins, right?
oil
Postmaster
Joined: Sep 2006
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From: Maryland
I use the 15w40 Premium Blue in the Summer and 5W40 Premium Blue Extreme in the Winter. As expensive as it is, the 5W40 shows the best performance overall but especially as it relates to regen frequency.
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From: Pacific NW
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I'm a fan of the AMSOIL products. Started using it in my Harley and boat. Changed the diesel over at 15k. Get the oem 5w40 for about 90.00 for 3.5 gallons. After 1500 miles is appears cleaner/clearer than motorcraft did.
Tuned
Joined: Oct 2013
Posts: 281
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From: Gen. 7 Texan
I'm about to get my first oil change. It looks like the Valvoline Blue and Extreme Blue seem to be the favorites on this thread. I have noticed three different weights. 5/40,15/40, and even 10/30 mentioned (Not all Valvoline). So can someone tell me which weight is the best? I live in north Texas so it's as hot as it gets some of the time, moderate some of the time, and cold with some freezing for two to three months a year. Thanks in advance.
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In a hot climate like yours 15W-40 will work fine. The important number here for hot climates is the 40. 15W-40 is significantly cheaper than 5W-40. 5W is best in real cold climate areas, like what I see here in Michigan.
Both Valvoline Premium Blue products use dispersive polymer technology (DPT), with premium Group II base oil for better soot control (reduces active regens).
Both Valvoline Premium Blue products use dispersive polymer technology (DPT), with premium Group II base oil for better soot control (reduces active regens).
Last edited by Romeo Scorpion; Dec 4, 2013 at 06:29 PM. Reason: Typo
Tuned
Joined: Oct 2013
Posts: 281
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From: Gen. 7 Texan
In a hot climate like yours 15W-40 will work fine. The important number here for hot climates is the 40. 15W-40 is significantly cheaper than 5W-40. 5W is best in real cold climate areas, like what I see here in Michigan.
Both Valvoline Premium Blue products use dispersive polymer technology (DPT), with premium Group II base oil for better soot control (reduces active regens).
Both Valvoline Premium Blue products use dispersive polymer technology (DPT), with premium Group II base oil for better soot control (reduces active regens).
Postmaster
Joined: Sep 2006
Posts: 2,598
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From: Maryland
If you go by Ford's recommendations, 15W40 is only suggested down to like 30* (that may not be right), but it can be used. If you are going to run 15w40 in the teens, let the truck warm up for a minute or two before you go out and romp on it. 10w30 or 5w40 is recommended in freezing temperatures.
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I used 15w-40 for three winters in my truck.
The coldest was 8°F, I just let it warm up for awhile.
Down here though, even if it's that cold in the early morning, it's usually above freezing by lunch so I never saw it as much of a concern as long as I take it easy.
It's only that cold for a few weeks, anyways.
The coldest was 8°F, I just let it warm up for awhile.
Down here though, even if it's that cold in the early morning, it's usually above freezing by lunch so I never saw it as much of a concern as long as I take it easy.
It's only that cold for a few weeks, anyways.
Laughing Gas
Joined: Jan 2006
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From: Gig Em, Tx
So why not do a PCV reroute like we did on the 7.3s? Keep the crankcase crap out of the intake and turbo and cut down on regens at the same time. I looked into my intake and could see traces of oil coming from the PCV inlet to the intake. On the downside, if the PCV system breathes in and out, a reroute may introduce contamination to crankcase by inhaling unfiltered air. Just thinking out loud.
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So why not do a PCV reroute like we did on the 7.3s? Keep the crankcase crap out of the intake and turbo and cut down on regens at the same time. I looked into my intake and could see traces of oil coming from the PCV inlet to the intake. On the downside, if the PCV system breathes in and out, a reroute may introduce contamination to crankcase by inhaling unfiltered air. Just thinking out loud.
BTW, it may breathe in a little after the engine is shut down and begins to cool off, but while its running the crankcase definitely shows positive pressure.
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