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2021 2500 ram 6.7l diesel 5w 40 oil

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jon1704

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Hello guys can you all help me out with using 5w 40 oil in my diesel , I live near Pittsburgh PA and was thinking of going to this oil for the winter but can't find at what temps its used . would you all stick with 10w 30 or switch to 5w 40 for the winter ..? any help or thoughts would be welcome .
 
jon1704 said:
Hello guys can you all help me out with using 5w 40 oil in my diesel , I live near Pittsburgh PA and was thinking of going to this oil for the winter but can't find at what temps its used . would you all stick with 10w 30 or switch to 5w 40 for the winter ..? any help or thoughts would be welcome .
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You can run 5-40 all year if you want to run synthetic oil.
I don’t remember the actual temperature but I think any temps below 0 they recommend 5-40.


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All oil in these engines should be synthetic only, but just run 5w-40 year round your not in Florida or places where it gets that hot
 
I am running Delo 400 XPS 5-40 it’s a full Synthetic in my 6.7 and I find it runs a little better and gets better fuel mileage. I am in CT.
 
Thanks for your help , I think im going to go with 5w 40 next months oil change then go back to 10w 30 in late spring . fingers crossed ...lol
 
Yeah being this is my first diesel the 5w 40 oil through me all i could find its for cold weather . but cold like Pittsburgh or cold like Alaska lol
 
I am going to run it all year long.
 
H3LZSN1P3R said:
All oil in these engines should be synthetic only, but just run 5w-40 year round your not in Florida or places where it gets that hot
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That's not what RAM OIL TSB states.

10W-30 Dyno oil is acceptable. If it's 5W-40 it has to be synthetic.

RE: Running 5W-40 in northern climes year round - I agree.
 
Brutal_HO said:
That's not what RAM OIL TSB states.

10W-30 Dyno oil is acceptable. If it's 5W-40 it has to be synthetic.

RE: Running 5W-40 in northern climes year round - I agree.
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I didnt know you can get 10w-30 Diesel oil in a mineral oil every one i see around here is Syn only… good to know lol
 
Owner manual gives the temp data and says 5w-40 is okay in all temps. I run 5w-40 100%
 
I have only been able to find 5w40
 
jon1704 said:
Yeah being this is my first diesel the 5w 40 oil through me all i could find its for cold weather . but cold like Pittsburgh or cold like Alaska lol
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For all trucks, regardless of model year, located in areas where the ambient temperatures routinely

fall below 0°F (-18°C) during the winter, it is required to use 5W-40 synthetic engine oil that
meets US Material Standard MS-10902, and API CJ-4. Oils that meet this requirement can be found

through Mopar, as well as Shell in the Rotella and the Rimula families. Although this grade of oil is

required in colder climate areas, it is also safe to use during the summer months, and in warmer

climates as well.

However, for vehicles normally located in areas that routinely stay above 0°F (-18°C), there are two
grades of engine oil recommended depending on the model year of the vehicle:
• 2018 model year, and older vehicles, it is recommended to use 15W-40 engine oil such as
the Mopar, Shell Rotella and Shell Rimula branded oils that meets US Material Standard

MS-10902 and the API CJ-4 engine oil.
• 2019 model year, and newer vehicles, it is recommended to use 10W-30 engine oil such as
Mopar, Shell Rotella and Shell Rimula that meets FCA Material Standard MS-10902, and the

API CK-4 engine oil category is required. Products meeting Cummins CES 20081 may also be

used
 
Well what if ya don't live in a colder climate?
Sure it'll get chilly, down to about +20 on it's coldest here. But is 5w40 still safe to run, when you only drive between Louisiana to Oklahoma at 110+ degrees out?
I just got my first oil change yesterday, that 5w40 seemed kinda thin & has me a little worried.
Should I have insisted on 10w30?
 
40 weight when hot is thicker than 30 weight when hot. That’s how I understand it anyways. The first number is the cold temp flow the 2nd number is the hot temp flow If I understand oil rating numbers correctly.
 
flan said:
40 weight when hot is thicker than 30 weight when hot. That’s how I understand it anyways. The first number is the cold temp flow the 2nd number is the hot temp flow If I understand oil rating numbers correctly.
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5w-40 has better cold weather and hot weather performance than 10w-30. 10w-30 might net you a fraction of a mpg better.

I run 5w-40 year round in temps from sub-zero to above 100°.
 
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