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OK to switch oil?


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#16 David Brown OFFLINE  

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Posted December 07, 2015 - 05:37 AM

The difference in the 10 winter viscosity vs 15, is not really noticeable south of the Arctic Circle. LOL Really, would not switch from Rotella in a diesel, it's the oil the vast majority of fleets run in their trucks.

Oh, I'm not about to switch from Rotella.  I will always use that in my diesels.  I just wondered about going from 15W40 to straight 30 weight or whatever.  Either way, it would be Rotella.


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#17 VICHARRIS OFFLINE  

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Posted December 08, 2015 - 09:24 PM

I believe in using multi-grade oil for diesel engines. Because we have 2 VW Jetta diesels. The same oil is used in John Deere diesel is synthetic 5w40 Castrol for diesel.


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#18 gksyn OFFLINE  

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Posted September 16, 2016 - 08:12 AM

Different brands flow different when cold.This was a cold flow test that someone done on various synthetic oils.

https://www.youtube....h?v=uQ_vxdO_9nc

This video isn't an accurate description. It's not in a controlled environment.

looks like Mobil 1 is something to consider.
I looked, they do have a 10w-40 Diesel Synthetic.

Why cant you switch back and forth Synthetic/non synthetic?

You can switch back and forth between them, but why would you switch from a superior product to an inferior one?

I believe in using multi-grade oil for diesel engines. Because we have 2 VW Jetta diesels. The same oil is used in John Deere diesel is synthetic 5w40 Castrol for diesel.

Even if your owner's manual says SAE 30 or any straight weight viscosity, you are okay to use a Mult-grade viscosity oil, as long as your numbers match!
For example, SAE 30 and 10W-30

The first part of the multi-grade is the viscosity that the oil flows at during temperatures less than operating temperature. typically under 180-212 degrees Fahrenheit. So even in the summer time, when it's 110 degrees Fahrenheit out, your oil is not at operating temperature.
So it's better to use multi-grade for pumpability. Which provides better protection, since you're not starving parts of the engine that need lubrication.

There are a lot of misconceptions in oil. I hope I was able to answer some of them.

#19 Username OFFLINE  

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Posted September 16, 2016 - 08:31 AM

This video isn't an accurate description. It's not in a controlled environment.


What do you believe is inaccurate about the test?

#20 gksyn OFFLINE  

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Posted January 31, 2017 - 10:36 AM

What do you believe is inaccurate about the test?

Sorry for the extreme tardiness on the response. Too much going on in life to keep up with everything. Ah.

A few things:
Pour rate is affected by the difference in bottles.
They tested oil that's only rated down to -35, -30F (5W), for a -40F test, 0W should be used.
What does the test represent? If -40F is something you'll run into, you won't be using a 5W weight. So it's a backyard test that is trying to mimic an ASTM standard test that all oils have to pass, without all the laboratory quality.

Don't get me wrong, I'm all for back yard scientists, I'm one myself, but I make sure to take it for what it is worth.
I hope I helped some.




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