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Wrong Viscosity

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  #16  
Old 11-14-2018, 02:50 PM
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Originally Posted by orion250
In a hurry, bought 15w40 when I should have bought 5w40. Changing it out today but the question is, will leaving the oil that's in the filter be ok, or just suck it up and drain it too and buy a new filter?

Thanks!

I’d leave the filter and just replace the 12 qts.
 
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  #17  
Old 11-14-2018, 03:08 PM
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This chart says it is good to -15. I go with "don't waste your money and change it at next interval."
https://www.google.com/url?sa=i&sour...42315886550811
 
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Old 11-14-2018, 03:31 PM
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Originally Posted by orion250
Yeah, I live in Colorado and it was 15 degrees out this morning and it's going to get colder.
I'd be plugging in the block heater. It'll start much easier and your engine will love you for it.
 
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Old 11-14-2018, 04:10 PM
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Originally Posted by hansenlink
This chart says it is good to -15. I go with "don't waste your money and change it at next interval."
https://www.google.com/url?sa=i&sour...42315886550811
LOL I would go with the Ford Chart. Who knows what went into the testing of this one.
 
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  #20  
Old 11-14-2018, 05:00 PM
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Originally Posted by Flyct


Owners manual does not recommend 15W40 below 20 dF in the 6.7L Diesel.

5W40 iwill flow WAY BETTER flow at low temps.

Here’s the page from the manual.






sure. I know Ford recommends that and if op is that worried then he should change it.

here is sae chart

 
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  #21  
Old 11-14-2018, 05:02 PM
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That generic SAE chart states -15C (+5dF) not -15dF for 15W40. That’s a big difference.

The Ford Owner’s manual shows -7C = +20dF

I would go with the Ford engineers recommendations for their Diesel engine, not a generic table.
 
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  #22  
Old 11-14-2018, 05:07 PM
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just plug it in and run it.
 
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  #23  
Old 11-14-2018, 05:10 PM
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Originally Posted by hansenlink
This chart says it is good to -15. I go with "don't waste your money and change it at next interval."
https://www.google.com/url?sa=i&sour...42315886550811
if you read the text in the link you provided EVEN THEY STATE to use the OEM recommendation.

Name: qd4CU3Jl.jpg Views: 22 Size: 90.6 KB
 
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  #24  
Old 11-14-2018, 06:30 PM
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What exact oil are we talking about anyway?
 
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Old 11-14-2018, 08:28 PM
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I bought Shell Rotella 15w40. Not gonna chance it. Got Rotella 5w40 on the way with new oil filter.

Thanks for all the replies! ;p I definitely stirred the pot with this one...
 
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  #26  
Old 11-14-2018, 08:40 PM
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Is the real issue that during cold startup, cold temps mean thicker oil which means less lubrication? As soon as the trucks heats up a bit, does it make a difference? Yes, I know you then have to wait for a min or two to heat the engine up, but is a cold start up the real issue? Educate me.
 
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  #27  
Old 11-14-2018, 09:24 PM
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Originally Posted by orion250
I bought Shell Rotella 15w40. Not gonna chance it. Got Rotella 5w40 on the way with new oil filter.

Thanks for all the replies! ;p I definitely stirred the pot with this one...

Good news. Rotella has rebates on T5 15W40 and T6 5W40.
Online rebate link follows:
https://rotella.shell.com/en_us/coup...Rpb25hbDE4Lw==
I bought 4ea 3 gallon boxes of T6 from Sams Club and got $84 in rebates. 4 x $21.
You can file the rebate form online and upload receipts online. Just make sure that the receipt has the retailer name, product, date purchased and cost.






 
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Old 11-15-2018, 05:08 AM
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And the rebate turn around time is just a couple of weeks!

As to the real issue on cold startups, yes the oil will be thicker, but once warmed up the oil would be fine.
 
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  #29  
Old 11-15-2018, 05:56 AM
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Originally Posted by LCA078
Is the real issue that during cold startup, cold temps mean thicker oil which means less lubrication? As soon as the trucks heats up a bit, does it make a difference? Yes, I know you then have to wait for a min or two to heat the engine up, but is a cold start up the real issue? Educate me.
This thread is what changed my mind. Some info there...
https://www.bobistheoilguy.com/forum...opics/535277/1
 
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  #30  
Old 11-16-2018, 11:00 AM
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15-40 oil
I live in central Ontario, Canada. I have run Rotella 15-40 in diesel pickups for over 30 years in all sorts of weather. We do get very cold weather. I routinely run 600,00 km or more and have had no problems. I do not start in cold weather and then put the pedal down right away. Give the engine a couple of minutes for fluids to warm up. No problem.
 
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